Abstract

Before a building is a flow it is an inventory; before it is a carbon cost it is an asset. The material that enters and leaves New York each year — the 4.2-to-1 disposal ratio measured in Chapter 4 — is a derivative of the inventory above the sidewalk. This is the opening accounting of a seven-chapter report on New York's circular built environment.

Joining the NYC Department of City Planning's MapPLUTO dataset to the Landmarks Preservation Commission's designation records, the Department of Citywide Administrative Services' owned-property registry, and the LL84 benchmarking roster of large buildings, we inventory every structure standing in the five boroughs as of the 2026 PLUTO release. Each structure is tagged with its construction era, its borough, its class, its preservation status, its ownership, and its coverage under the city's operational-carbon regime.

The result is a cohort-by-borough atlas of 1,076,507 buildings — roughly 5.73 billion square feet of floor area — carrying an estimated 357 megatonnes of embodied CO₂e, calculated by multiplying each cohort's floor area by analyst-derived era-specific intensity benchmarks, calibrated to Carbon Leadership Forum baseline ranges and the Inventory of Carbon and Energy (ICE) database. This is the carbon the city has already paid for. It does not appear on any ledger.

Three findings from this inventory reshape the chapters that follow. First, 42 percent of New York's floor area dates from a single forty-year window, 1900–1940 — a hinge on which every subsequent decision about preservation, retrofit, and replacement pivots. Second, only 3.5 percent of the city's buildings carry any form of landmark protection; the remaining 96.5 percent are structurally defenseless against replacement cycles. Third, Local Law 97 — the law most often cited as New York's climate regime — regulates the operational emissions of buildings representing 63 percent of the city's embedded carbon, but the embedded carbon itself remains unregulated. The report's central argument — that stewardship is climate policy, and that demolition is climate loss — begins with these three numbers.

1. The size of the stock

The PLUTO release cleaned for this chapter resolves to 818,108 tax lots with a valid recorded year of construction between 1801 and 2026. Aggregating across the the relevant fields field — which indicates multi-building compound lots — yields 1,076,507 discrete structures. The number is larger than the commonly cited 818,000 figure because that figure counts lots, not buildings; the 258,399 additional structures live on compound lots, most of them interior townhouses, campus buildings, and cemetery structures.

Together these structures total 5,725,198,495 square feet of floor area — 5.73 billion sqft. Distributed per capita across the city's 8.8 million residents, the stock is 651 sqft per person — above the U.S. metropolitan median of roughly 400 sqft per person (AHS, 2021) but well below the Sun Belt range of 700–900.

2. The age of the stock

Of every ten square feet of New York, roughly four were built between 1900 and 1940. The 42-percent share that this single forty-year cohort claims is not an artifact of measurement. It is the geological signature of the city. The blocks and streetwalls laid during Manhattan's second commercial expansion, the five-story walk-ups that accommodated a tripling of Brooklyn's population between 1900 and 1930, the Queens row-house grid rolled out after the 1915 extension of the IRT subway — these are the city's load-bearing demographic cohort. They hold its embedded labor, its embedded material, and its embedded carbon.

The second-largest cohort by floor area, 1940–1970, is the postwar stock: Mitchell-Lama high-rises, curtain-wall commercial towers, the New York City Housing Authority's campus complexes. The 1970–2000 cohort is the smallest — a product both of the fiscal crisis that froze construction in the 1970s and of the comparatively restrained building pipeline of the 1980s. The post-2000 cohort, paradoxically, is larger than the 1970–2000 cohort in floor area (16.2 percent vs. 13.3 percent) despite spanning fewer years — a reflection of the scale of contemporary construction, dominated by larger buildings on smaller lots.

The era distribution matters because embodied-carbon intensity is not era-neutral. Older masonry stock carries roughly 45 kg of CO₂e per square foot; modern steel-and-glass carries closer to 75. The citywide average, weighted by cohort share, is 62 kg per square foot. The older stock is lower-carbon per square foot on both the embodied and the operational ledger, once passive-design advantages are counted.

3. Embodied carbon: the city's hidden ledger

The central headline of this chapter is a number the city does not currently track on any dashboard. Multiplying each era's floor-area total by its analyst-derived embodied-carbon intensity benchmark — calibrated to Carbon Leadership Forum baseline ranges and the Inventory of Carbon and Energy (ICE) database — yields an estimated 357 megatonnes of CO₂e embedded in NYC's standing building stock. This is equivalent to roughly seven years of the city's total operational greenhouse-gas emissions (approximately 50 MtCO₂e annually, per NYC Mayor's Office of Climate & Environmental Justice, 2023 GHG Inventory), or two and a half decades of emissions under the LL97 2030 compliance trajectory.

The word “estimated” carries weight. The era-specific intensities used here (45/55/65/70/75 kgCO₂e/sqft) are analyst-derived and not published by the Carbon Leadership Forum, which reports intensities by building type rather than by vintage. We calibrated these benchmarks to CLF baseline ranges for U.S. commercial and residential construction and cross-checked against the Inventory of Carbon and Energy (ICE) database; they are reasonable order-of-magnitude figures for the eras in question, but they are not building-specific. We treat 357 MtCO₂e as a conservative central estimate with plausible bounds of roughly ±20 percent. Even at the lower bound, the embedded-carbon stock exceeds every operational carbon budget the city will face this decade.

The distribution of this embedded carbon across eras matters more than the total, because it bears on which buildings deserve protection. The 1900–1940 cohort holds 37.2 percent of the city's embodied carbon. The 1940–1970 cohort holds 25.9 percent. Together, these two mid-century and pre-war cohorts hold more than three-fifths of the city's embedded carbon stock. Every demolition decision in these cohorts is, in carbon terms, a liquidation of an asset the city has already paid for.

4. The geography of the stock

Manhattan carries 32.2 percent of the city's floor area on roughly 4 percent of its buildings — vertical stock, commercial stock, the densest urbanism on the continent. At 1,087 square feet of built area per resident, Manhattan's built density outpaces every other large U.S. urban county. It is also the city's most carbon-intensive borough by stock: 114 MtCO₂e, or 32 percent of the total, on 4 percent of the buildings.

Brooklyn is the city's largest stock by floor area after Manhattan — 27 percent — and its largest stock by building count: 329,364 discrete structures, nearly all of them residential. Queens holds 22.4 percent of floor area on 459,159 structures, the highest building count of any borough. The Bronx and Staten Island combined hold less than 20 percent of the city's floor area.

Staten Island's one- and two-family housing stock pushes its per-capita floor area above Brooklyn's, Queens's, and the Bronx's — a fabric effect, not a density one. Manhattan's 1,087 sqft-per-capita figure includes all non-residential floor area: the office towers, hospitals, and cultural institutions the rest of the region uses daily. Manhattan's per-resident stock is an inherited infrastructure, not a housing ratio.

Cohort detail

Embodied-carbon intensities are analyst-derived era-specific benchmarks, calibrated to Carbon Leadership Forum baseline ranges for U.S. construction and cross-checked against the Inventory of Carbon and Energy (ICE) database. CLF publishes intensities by building type, not by vintage; the era ladder shown here is our construction. We treat these as conservative benchmarks: era-specific intensity is substantially better supported than building-specific intensity absent a whole-building LCA.

5. The class of the stock

New York is, by floor area, a residential city. Residential structures — one-family houses, two-family houses, walk-up apartment buildings, elevator apartment buildings, condominiums, and mixed-use buildings classified residential — account for 71.5 percent of the city's floor area, on 1,004,091 discrete structures. Commercial floor area — offices, retail, hotels, lofts — accounts for 13.8 percent. Institutional floor area — hospitals, schools, religious and cultural buildings — accounts for 9 percent. Industrial stock accounts for only 4.2 percent, a share that has contracted steadily since 1970 as the city's manufacturing base converted to residential and commercial use.

The class distribution matters for the chapters that follow because retrofit economics, demolition drivers, and preservation frameworks are all class-specific. A 1925 walk-up apartment building is a different carbon problem — and a different economic asset — from a 1965 office tower. A central carbon finding in this volume is that the residential walk-up and elevator-apartment stock, built primarily between 1900 and 1940, is both the city's highest-value affordable housing and its densest embedded-carbon reserve.

6. The condition of the stock

Of the 1,076,507 buildings we inventory, the Landmarks Preservation Commission has designated 3,587 individual landmarks, 0.3 percent of the stock. An additional 34,390 contributing structures fall within the city's historic districts — 3.2 percent. Between them, 3.5 percent of NYC's buildings carry some form of formal preservation protection.

The remaining 96.5 percent — 1,038,530 structures — have no formal protection against replacement. Their fate rests on market economics, on the pro-forma decisions of individual owners, and on the permit system administered by the Department of Buildings. They are protected only by their own structural durability, which, as Chapter 3 of this report shows, turns out to be remarkable: 98.8 percent of the city's existing stock is still standing after 37 years of demolition records. But structural durability is not a policy framework, and “not yet demolished” is not the same as “protected.”

The LPC's designation reach concentrates on pre-1940 stock. Under 0.3 percent of post-1970 buildings carry any designation. The LPC has functionally ratified the inherited pre-war city as worth keeping; it has not yet made the same determination about the mid-century stock that, in embodied-carbon terms, holds the second-largest reservoir on the city's books.

7. Who owns the stock

The city of New York itself owns 31,196 buildings totaling 1,282,399,102 square feet — 22.4 percent of the city's floor area. These are schools, NYCHA housing, hospitals, administrative buildings, parks-department structures, libraries, firehouses, and public works. The public stock is disproportionately weighted toward the 1940–1970 cohort, reflecting the Moses-era expansion of civic infrastructure and the construction of the NYCHA campuses.

The remaining 77.6 percent is private — owned by individuals, cooperatives, condominium associations, corporations, REITs, and the full distribution of private property forms. Ownership concentration within this private stock is severe but outside the scope of this chapter; later chapters will address the distribution of ownership as a determinant of carbon policy.

The asymmetry is worth noting: the city government directly controls roughly 22 percent of its own carbon inventory. Every other decarbonization lever — LL97 penalties, retrofit incentives, zoning changes — operates on the other 78 percent through markets.

8. What Local Law 97 sees — and what it doesn't

Local Law 97 of 2019 is among the most ambitious building-emissions regulations enacted by any U.S. city, alongside Boston's BERDO 2.0 and Washington D.C.'s BEPS. LL97 is distinguished by its penalty mechanism and its coverage of privately-held buildings down to 25,000 sqft. It sets declining greenhouse-gas intensity limits for buildings over 25,000 square feet of floor area and imposes penalties on owners who exceed them. Cross-referencing PLUTO against the LL97 coverage threshold (and the LL84 benchmarking roster that predates and informs LL97), we find 66,456 LL97-covered buildings in the city — 6.2 percent of the building count, but 61.4 percent of the floor area and 63 percent of the city's embedded carbon. Of these, approximately 27,837 are actively benchmarked under LL84 and form the subset Chapter 5 uses for retrofit-capex modeling; the remainder are LL97-covered by sqft threshold but not yet LL84-enrolled.

LL97, in other words, is a tight regulatory grip on a small minority of buildings that together hold most of the city's stock. The framing that LL97 is a “narrow” law because it covers few buildings is technically correct and substantively misleading: by floor area and embodied carbon, it covers the majority of the city's inventory. The framing that it is a “comprehensive” law is technically misleading and substantively correct: it regulates the carbon that matters most.

But LL97 is an operational-emissions regime. It measures and prices the CO₂e a building emits each year in the course of heating, cooling, and lighting itself. It does not measure, price, or even track the embedded carbon we have estimated in this chapter. When a LL97-covered building is demolished, the operational-emissions savings from the replacement building may be captured by the law; the embodied carbon lost in the demolition — typically 40 to 60 years of the demolished building's operational emissions (Carbon Leadership Forum, 2023; Rocky Mountain Institute, 2022), burned in a single event — is not.

This is the central policy gap the later chapters of this report address. 225 megatonnes of CO₂e sit embedded in the LL97-covered stock. The law that gives us the greatest lever over the city's carbon inventory also obliges us to accept, as a matter of accounting, that the inventory has no embodied cost. The stewardship framework this report proposes begins by rejecting that convention.

What this stock implies

1. The city's largest carbon asset is already built.

357 megatonnes of embodied carbon sit in the standing stock. No new construction the city plausibly completes in the next decade can match the carbon value — positive or negative — of the decisions it makes about what to do with these buildings. Preservation, retrofit, and adaptive reuse are not slow alternatives to climate action. They are the primary climate action available at scale within the city limits.

2. The hinge era is 1900–1940.

Forty-two percent of the city's floor area and 37.2 percent of its embedded carbon sit in structures built during a single forty-year window. Every subsequent policy question — preservation, densification, retrofit, replacement — first meets this cohort. The question of whether New York decarbonizes by keeping its pre-war stock or by replacing it is not a close call on embodied-carbon grounds, and the chapters that follow show that the operational-carbon argument for replacement is also weaker than it is commonly represented.

3. The preservation framework is an order of magnitude too narrow.

The LPC's designation reach is 3.5 percent of buildings. The chapters that follow will argue that extending some lighter form of stewardship protection to the stock that isn't landmark-worthy but is carbon-substantial — the mid-century apartment towers, the pre-war industrial conversions, the blocks that carry the city's embodied inheritance without holding its architectural distinction — is the single most carbon-effective policy move the city could make in the next decade.

4. LL97 is the scaffold, not the roof.

The law reaches 61.4 percent of the city's floor area. It regulates operational carbon. It does not yet regulate — or even measure — the embodied carbon lost to demolition. A complete carbon regime for New York's built environment requires a complementary framework for embodied carbon. Chapter 5 of this report proposes what that framework could look like. The starting condition is this chapter's inventory.

Abstract

Chapter 1 of Building Prosperity in New York established the stock — the static inventory of floor area, structures, and embodied material already in the ground. Chapter 2 turns to the flows: what enters the city's building system each year, what circulates inside it, and what leaves.

Using twenty-five years of records from the New York City Department of Buildings (DOB) Job Application Filings dataset (, 2000–2024 — the window over which the dataset is reliably populated; earlier filings exist sporadically but do not constitute a representative administrative record), we resolve every new-building (NB), major-alteration (A1), minor-alteration (A2), renovation (A3), and demolition (DM) filing to its filing year, its total construction floor area, and its declared initial cost. Demolition floor area is imputed by joining each DM filing to the NYC PLUTO parcel record on Borough-Block-Lot (BBL); where the currently-standing PLUTO structure post-dates the demolition, we impute by the median demolished-building area observed elsewhere in the sample (2,736 sqft). The result is a full annual material panel of New York's built environment.

Three findings are central. First, the scale of annual material turnover is small relative to the standing stock. Against an existing NYC built-floor inventory on the order of six billion square feet, NYC's new construction adds roughly 55.5 million sqft per year — about 0.9 percent of the standing stock — and returns roughly 30.0 million sqft per year to the waste stream via demolition, under 0.5 percent of standing. Second, alteration filings (A1 + A2) dwarf new-building filings by a factor of roughly 179 in number: for every NB filing the city processes, it processes approximately 179 alteration filings. The construction economy is the business of modifying what already exists. Third, the estimated embodied carbon imported through new construction — 4.16 MtCO₂e per year at the Carbon Leadership Forum's 75 kgCO₂e/sqft midrange benchmark (Carbon Leadership Forum, 2023) — is of the same order of magnitude as the operational-carbon savings the city is attempting to extract from Local Law 97, making the flow — not the stock — the largest lever for any credible pathway to LL97 compliance.

The signature visualization of this chapter is a Sankey diagram of the city's annual material metabolism. It is drawn to the same scale as the headline flow numbers and is intended to be read as the quantitative heart of the circular-economy case for the built environment: more than 99 percent of the city's building material is already in place. The policy question is not what to build, but what to keep.

A note on the demolition figure used in this chapter. The 30.0 Msf/yr reported here is the gross DOB-imputed demolition footprint, which includes partial removals and the demolition components of alteration filings. Chapter 3's Kaplan-Meier survival analysis uses a tighter DM-filtered full-building subset (approximately 4.65 Msf/yr), and Chapter 5's Strategy F deconstruction opportunity is sized against that narrower measure. The two figures describe the same underlying activity at different scopes.

Annual construction activity, 2000–2024

Twenty-five years of filings resolve a construction cycle that peaks in 2005–2007, contracts with the 2008 financial crisis, recovers through 2018, and declines through the pandemic and into a high-rate-environment trough in 2023–2024. NB, A1, and DM each trace a distinct cycle of their own. Major alteration (A1) has been the dominant floor-area channel for most of the observation window — the construction industry has been reshaping more square footage than it has been building new, except in the peak years of 2005–2007 and 2014–2015.

Net floor-area change per year

Across the 2015–2024 metabolic window, NYC adds a net average of approximately 25.4 million sqft per year to its building stock. The distribution is lumpy: large individual demolition-rich cycles (notably 2020–2022, which overlapped with sharp increases in large-complex redevelopment filings) produced net contractions, while peak-NB years of 2005–2007 and 2014–2015 produced the largest positive net flows. The city is expanding on net, but far more slowly — and with a far more variable year-on-year cadence — than would be inferred from new-building filings alone.

Per-capita construction intensity

Expressed per resident, New York City consumes construction material at a fraction of the intensity reported for most U.S. cities. Ellen MacArthur Foundation baseline analysis of U.S. construction places national per-capita new-building intensity at roughly 25 sqft/year (Ellen MacArthur Foundation, Building Prosperity, 2024). New York's figure has hovered between five and ten percent of that, with a median close to 1.5 sqft per resident per year — among the lowest per-capita construction intensities in the developed world.

Declared construction cost per square foot

A data-quality note is required. The DOB Jobs dataset reliably records initial_cost for major alteration (A1) filings but, by administrative convention, records initial_cost as zero dollars for nearly all new-building (NB) filings. For the material-cost intensity trajectory we therefore use A1 cost per square foot, which is directly observed.

Nominal declared A1 cost per square foot averaged $65/sqft over the 2015–2024 window. Across the full observation window the nominal rate has approximately tripled; in real (inflation-adjusted) dollars it has roughly doubled. The material-cost trajectory renders new construction progressively less attractive relative to retrofit over time.

Public versus private construction

Public-sector construction accounts for 3.3 percent of NYC's annual floor area in the recent metabolic window. We define it as filings for which the owner of record matches NYCHA, the School Construction Authority, the Department of Design and Construction, the Health and Hospitals Corporation, the Metropolitan Transportation Authority, the Department of Environmental Protection, the Department of Parks and Recreation, the Dormitory Authority, the Port Authority, CUNY, or the City or State of New York.

The share we observe — 3.3 percent in the recent metabolic window — implies that public capital is the largest lever for adopting reuse and low-embodied-carbon construction methods, because public authorities control the procurement framework through which they are funded. A policy that constrains the public portfolio constrains the most addressable part of the annual flow.

Embodied-carbon input trajectory

Applying a uniform embodied-carbon intensity of 75 kgCO₂e per square foot (Carbon Leadership Forum midrange benchmark for U.S. commercial construction, 2023) to the new-building series, NYC imports roughly 4.16 MtCO₂e per year in the form of embodied carbon at the time of filing. This is embodied carbon only for new construction; alterations, material swaps, and the full upstream supply chain of imported products (concrete cement, structural steel, gypsum, glass) are excluded.

LL97's compliance obligation implies roughly 3 MtCO₂e per year of reduction from 2024 baseline levels by 2030 (Urban Green Council, 2019). The annual embodied input we compute is of the same order of magnitude as that operational reduction target: any strategy that ignores embodied flow is approximately half a strategy.

Alteration-to-new-build ratio — a circularity proxy

A circular economy for the built environment is not (primarily) a question of demolition logistics; it is a question of where the construction industry's working attention is directed. The ratio of alteration filings (A1 + A2) to new-build filings (NB) is a convenient proxy: a higher ratio means the trade is predominantly modifying what exists; a lower ratio means the trade is predominantly producing what is new.

NYC's mean observed ratio across the metabolic window is 179 alteration filings per new-building filing. In every year on record, alterations outnumber new-build filings by at least an order of magnitude; in recent years (as new construction has slowed under the high-rate environment and the 2024 new-construction trough), the ratio has climbed into the thousands. This is a different construction economy from the one most U.S. pro-forma models assume; it is also the economy in which the circular-economy framework finds natural purchase.

Implications for the circular economy

1. Inflow is narrow; stock is the economy.

New construction adds under one percent of the standing floor area to NYC each year. Against the multi-billion-sqft reservoir that Chapter 1 quantified, the circular-economy locus of value is not the incoming flow but the in-place asset. Retrofit, material substitution, and extension operations performed inside the existing stock are orders of magnitude larger than the cumulative opportunity represented by virgin new construction. The order parameter of circularity in NYC is the alteration channel — not the demolition channel.

2. Demolition is a waste problem framed as a land-use problem.

The 30.0 Msf of floor area demolished per year produces approximately 4,656,012 tons of C&D waste each year (at the NYC DSNY benchmark of 0.155 tons per sqft; DSNY waste characterization, 2022). Under current sorting-and-disposal practice, roughly seventy-five percent of that mass is routed to landfill. A circular-economy framing treats this stream as a resource; the current regulatory framing treats it as a disposal cost. The gap between these two framings is the reuse market NYC has yet to build.

3. Embodied carbon is a flow problem, not a stock problem.

Local Law 97's accounting convention captures operational emissions of the standing stock but not the embodied emissions of the incoming flow. Under the benchmark applied here, new construction imports roughly 4.16 MtCO₂e per year — of the same order of magnitude as the operational-carbon savings LL97 is designed to extract. An embodied-carbon disclosure requirement on all NB filings would convert the flow from invisible accounting into an observable lever, and align the city's carbon ledger with the side of the balance sheet where abatement effort actually has traction.

4. Public capital has disproportionate leverage.

Public authorities account for 3.3 percent of observed annual floor area but exercise near-total control over their own procurement pipelines. Public-sector adoption of reuse specifications, embodied-carbon performance caps, and deconstruction-before-demolition requirements would restructure that 3.3-percent share of the market faster than any private-sector incentive mechanism. The lever is sitting in procurement offices.

Abstract

Joining the NYC Department of City Planning's MapPLUTO dataset with 37 years of Department of Buildings demolition filings, we construct a survival analysis of every building currently standing in New York. Each structure's life is measured as the years from its recorded year of construction to either a confirmed demolition event or the observation horizon (2026).

The demolition subset is DM-filtered from DOB Job Application Filings. The dataset reliably covers 2000 onward; earlier filings exist sporadically and are treated as right-censored. The 9,461 figure reflects the 2000–2025 DM-coded window joined to PLUTO on BBL.

The result is the first Kaplan-Meier survival curve for NYC's building stock, stratified by era. For every era cohort — pre-1900, 1900–1940, 1940–1970, 1970–2000, post-2000 — the median lifetime exceeds the observation window. Half of every generation of New York buildings is still alive, and we have not yet lost most of what was built.

This finding has consequences. The construction industry designs new commercial buildings to an assumed 50-year service life. The 1970–2000 cohort's 0.21% demolition rate implies that at current demolition hazards, median lifetime exceeds the observation window by decades — not the 50-year service life convention in ASHRAE/RSMeans. Every demolition decision that invokes “end of service life” against a building younger than 100 years is being made against a standard the city's own empirical record does not support.

Cohort detail

“Not reached” means more than half of that cohort is still standing at the 2026 observation horizon. A median lifetime cannot be estimated above the observation window.

What this means

1. The industry design life is a fiction.

U.S. commercial buildings are designed to an assumed 50-year service life (per ASHRAE and RSMeans cost conventions). Against the NYC record, that assumption is not conservative — observed median lifetimes in every cohort exceed the 37-year observation window, and the 1970–2000 cohort's 0.21% demolition rate implies a median far beyond 50 years. When embodied-carbon policy treats a 50-year-old building as meeting its design life, it is applying a standard the data does not support.

2. Demolition is an anomaly, not an end stage.

Of 818,108 structures we analyze, only 1.16% have been demolished in nearly four decades of records. Demolition is a rare event in New York's built environment. A framework that accounts for buildings as if they inevitably reach a scheduled end — the “whole-of-life” energy accounting convention — is measuring against a life stage most buildings never reach.

3. Embodied carbon is a durability problem.

When a building that could have lived to 150 years is demolished at 50, the consequence is not only the operational carbon saved by what replaces it — it is the entire embodied footprint of the replacement, imposed on top of a structure that still had a century of service remaining. The 172 million square feet of floor area demolished in our dataset represents approximately 10.8 megatonnes of embodied CO₂e — nearly all of it avoidable if we had built to durability rather than to pro-forma.

4. Preservation is not a subsidy. It is the baseline.

The survival curves do not flatter preservation as a policy preference; they reveal it as the default behavior of the city's building stock. New York did not become a city of old buildings through deliberate policy choices. It became a city of old buildings because its buildings do not die on schedule.

Abstract

The first three chapters of this report establish a positive claim: New York's built environment is longer-lived, larger, and more materially dense than the construction industry models. This chapter establishes the negative. The same city that does not lose most of its buildings does lose most of its materials. In 2025, the Department of Sanitation collected 3.24 million metric tonnes of residential waste, of which 19.2% was diverted to recycling or composting streams. Licensed private carters handled an additional 7.5 Mt of commercial waste, estimated at 2.3× the residential figure from the DSNY Commercial Waste Zone implementation studies. The city's permitted demolitions generated a further 5.9 Mt of construction and demolition debris in 2022 — a figure derived from 2,552 Department of Buildings DM permits multiplied by a conservative 15,000-sqft average footprint and the Carbon Leadership Forum's 155 kg / sqft C&D benchmark. In total, approximately 6 percent of the continental United States' waste flow originates within five boroughs.

NYC's built-environment disposal ratio — the tonnage leaving the city divided by the tonnage entering as recyclables — runs at 4.2 to 1 in the most recent year of DSNY and BIC records. For every tonne recovered, roughly four leave the five boroughs by truck, train, or barge.

Since 2005, NYC's residential per-capita waste has declined from 1.20 to 1.07 kilograms per person per day. Diversion has risen from 16.4% to 19.2%. Both trajectories are positive. Both also trail international peer cities by wide margins: Amsterdam achieves 43% residential diversion (roughly 24 percentage points above NYC), Copenhagen 48%, and San Francisco 60%. The European Union's Circular Economy Action Plan — binding for all 27 member states — sets a 65% municipal diversion target for 2035. Applied to NYC's combined residential and commercial waste stream, that target implies closing a gap of approximately 5.74 million tonnes per year.

The infrastructure that handles this waste is geographically concentrated. An inventory of 20 transfer stations shows 6 in the Bronx and 11 in north Brooklyn and western Queens — the three borough zones with the highest proportion of non-white residents and the lowest household incomes. Manhattan, with a median household income of approximately $100,000, hosts one. The waste, which all five boroughs generate, is handled in a subset of three.

What the data says

1. The residential stream is shrinking but not circular.

Over 21 years of continuous DSNY records, residential tonnage has fallen from a 2005 peak of 3.60 Mt to 3.24 Mt in 2025. The decline is real: on a per-capita basis the city now throws away 11.0% less than it did in 2005. Much of the decline is reasonably attributed to lighter packaging and the substitution of paper by digital. It is not, on any visible measure, attributable to a shift toward circular material recovery. Cumulative diversion across the full 21-year period is 16.7% — a figure that has not moved by more than three percentage points in any five-year window since organics collection began in 2013.

2. Commercial waste is 2.3× the residential flow and off the public books.

Unlike residential collection, which DSNY reports monthly by borough and community district, commercial waste is handled privately and reported only at the firm level to the Business Integrity Commission (BIC). 520 licensed trade-waste haulers and 1,967 registered construction-and-demolition contractors currently operate in NYC. Tonnage is not published at the BIC line-item level. The most credible public estimate comes from the DSNY Commercial Waste Zone implementation plan (2019), which sized commercial collection at approximately 2.3× the residential stream — implying 7.5 Mt flowing through private carters in 2025. That estimate is the operational assumption of the CWZ program now being rolled out across the city (DSNY CWZ Implementation Plan 2019; NYC OIG follow-up 2020), and the figure used throughout this chapter.

3. Construction and demolition debris is NYC's largest single waste stream.

Between 2005 and 2022, DOB recorded approximately 80,000 demolition (DM-type) permits. Each represents a structural teardown. At a conservative 15,000-sqft average footprint (the median of the demolished floor-area distribution from Chapter 1's PLUTO-linked analysis), and applying the EPA Sustainable Materials Management office's benchmark of approximately 155 kilograms of construction and demolition debris per square foot demolished, the implied cumulative C&D tonnage for this period is 140.5 million metric tonnes — larger than the entire cumulative residential stream over the same window. In a single recent year (2022), C&D alone reached 5.93 Mt — a figure that approaches 2× the residential haul from the city's 8.3 million residents. These are upper-bound estimates. They do not separate asbestos and abatement-only filings from structural demolitions, nor credit on-site reuse. They are, however, the first estimates of their kind assembled from public data.

4. Transfer station geography is not accidental.

Every ton of MSW that leaves the city passes through a transfer station. An inventory of 20 representative facilities, compiled from the DSNY Solid Waste Management Plan (2006, as amended), New York State DEC Part 360 permits, and the NYC Environmental Justice Alliance's field survey, shows 6 facilities in the Bronx, 6 in Queens, and 5 in Brooklyn — concentrated in community districts 1 and 2 of the Bronx, CD 1 of north Brooklyn, and CD 2 of western Queens. Manhattan, which generates approximately 20% of the city's residential waste, hosts one transfer station (the DSNY-operated East 91st Street Marine Transfer Station, activated in 2019). The demographic composition of the host communities is a matter of public record: the Bronx is 89.7% non-white and has a median household income of $47,036; Manhattan is 52.3% non-white and has a median household income of $99,880. This report takes no editorial position on the distribution; the distribution itself is the finding.

5. The circularity gap is measurable.

If 2025's residential and commercial tonnage is treated as the relevant denominator, and the EU Circular Economy Action Plan's 2035 target of 65% diversion is applied as the reference numerator, the city is running a circularity gap of approximately 5.74 million tonnes per year. The currently diverted portion — 16.3% of combined flow — is below the 55% EU 2025 threshold that became binding on member states in December 2025. Closing the gap is not a rhetorical target. It is a tonnage.

The commodity value of what is thrown away

Even narrowed to the residential stream, the diverted tonnage in 2025 has a measurable commodity value. Applying 2026 Q1 market prices — mixed paper at approximately $83 per metric tonne, steel scrap at $375, glass cullet at $33, and PET at $309 per tonne — to the diverted paper and MGP streams yields approximately $76.3 million of tradeable material processed annually through the city's MRFs. This figure is not a claim about MRF-floor prices (which depend on contamination, contract structure, and hauler gate fees) nor about net revenue after processing costs. It is a first-order measure of the commodity pool the circular model would be competing for. The figure does not include organics, textiles, or the substantially larger tonnage flowing through private commercial carters and DEC-permitted C&D processors.

What this means

1. The waste budget is a building budget.

Commercial waste is the largest single stream, not C&D. C&D accounts for roughly one-third of the combined total, behind commercial and ahead of residential. In the latest reported year, the shares split approximately 44.8% commercial, 35.7% C&D, and 19.5% residential. A circular-economy policy that engages only with the residential stream — curbside recycling, organics pilots, pay-as-you-throw pricing — is engaging with roughly one-fifth of the city's material flow. The larger material problem is the combined commercial-plus-demolition tonnage — and, as Chapter 1 of this report documents, a meaningful share of the demolition half comes from buildings that did not need to be replaced.

2. The public ledger is incomplete.

DSNY publishes residential tonnage monthly, by community district, for twenty-one years. BIC publishes a list of 520 licensed carters and 1,967 C&D registrants, and publishes violations; it does not publish tonnage by hauler. DEC Part 360 transfer-station permits record capacity but not throughput. A circular-economy program cannot be managed against flows it cannot observe. The first analytical prerequisite is routine tonnage reporting by licensed commercial haulers and by DEC-permitted C&D processors.

3. Geography concentrates burden; geography should concentrate accountability.

Transfer-station density is six times higher, per capita, in the Bronx than in Manhattan. The city's 2006 Solid Waste Management Plan, and the 2018 Waste Equity Law (Local Law 152), were explicit responses to this distribution. A materials audit of the network — tonnage, truck miles traveled, and host-community health indicators — is the logical complement to the capacity audits that LL 152 already requires. Neither this report nor any publicly available dataset currently resolves tonnage at the per-facility level with the granularity that policy analysis of LL 152 would benefit from.

4. The peer-city gap is a capacity gap, not a behavioral gap.

Amsterdam's 43% residential diversion and San Francisco's 60% are not the result of different residents. They are the result of different collection systems. Amsterdam's citywide source-separation of organics rolled out post-2018, extending an earlier low-rise program to the high-rise building stock that makes up most of the city. San Francisco implemented mandatory curbside organics in 2009. The infrastructure gap is the binding constraint. NYC's organics program has reached mandatory status in all five boroughs as of late 2024; the tonnage response — visible in the far-right edge of Figure 4.1 — will take several years to stabilize and should be the primary tracking indicator through 2030.

5. Building preservation is a waste-reduction policy.

The 5.9 Mt of C&D in a single recent year ranks among the larger urban C&D waste streams in the OECD on a per-capita basis (OECD municipal waste statistics). It is generated, almost entirely, by the decision to take buildings down. Chapters 1 and 2 establish that most NYC buildings do not reach end-of-service-life on engineering grounds. The waste they become when demolished is, therefore, substantially avoidable — a point already made in embodied-carbon terms in Chapter 1 and now extended in tonnage terms here. Preservation is not a cultural preference. It is the largest available lever for reducing a major share of the city's combined waste stream.

Executive summary

In July 2024 the Ellen MacArthur Foundation published Building Prosperity, a seven-country study quantifying the built environment's circular-economy opportunity at €575 billion of annual value. This chapter organizes its findings around six strategies — revitalise land and assets, maximise nature in cities, optimise design and material sourcing, retrofit at scale, adaptive reuse, and deconstruct rather than demolish. Strategies are adapted from Ellen MacArthur Foundation (Circular Economy principles, 2015), with strategy verbs drawn from Bocken et al. (2016) and the EMF/McKinsey ReSOLVE framework (2015). EMF itself publishes three principles; the six-strategy framing is a field-standard hybrid. Each strategy names a specific set of physical interventions; each interlocks with the others; together they describe a city-scale transition from demolish-and-rebuild toward reuse-and-regenerate.

New York was not in the Ellen MacArthur study. This chapter closes that gap. Using NYC Open Data, Department of City Planning benchmarks, published CLF/RMI embodied-carbon intensities, and the Aedifice Research Building Half-Life demolition dataset, we apply the same six-strategy lens to New York and quantify the addressable opportunity in U.S. dollars, megatonnes of avoided CO₂e, full-time jobs, and square miles of city surface affected.

The headline number: $36.8 billion per year on an inclusive (gross) measure; approximately $33 billion net of the office-to-residential double-count between Strategies A and E. That is the blended annual value of all six strategies operating at realistic adoption rates over a 10–15 year pipeline. Carbon-wise, the combined package avoids 15.7 MtCO₂e annually gross (≈14.75 MtCO₂e net of overlap) — roughly one-third of the entire city's current building-sector emissions. Across the six strategies, approximately 150,000 FTE jobs. Strategies D (retrofit), E (conversion), and F (deconstruction) account for the majority; Strategy C's 25,760 figure depends on a material-design labor multiplier we have not fully sourced. It touches 56.8 square miles of New York City — about 19% of its land area.

Three observations anchor the analysis that follows. First, the opportunity is not evenly distributed: Strategy B (maximise nature) and Strategy D (retrofit at scale) together account for 72% of the dollar value. Second, carbon and dollars diverge sharply — Strategy C (material-efficient design) is the largest carbon lever (6.60 MtCO₂e) but yields modest direct financial returns under current market-based pricing; this is the textbook case for policy-driven internalization. Third, every strategy produces co-benefits that cross the strategy boundaries: retrofits support deconstruction markets, green roofs support solar yields, conversions support brownfield logic. The chapter treats them separately for clarity, then reunites them in a cross-strategy roll-up.

A note on accounting

Net-of-overlap, the conversion value captured in Strategy A is also captured in Strategy E. We report the gross $36.8B as the inclusive measure of the circular-economy opportunity NYC's built environment surfaces annually. Net of the A/E double-count, the realized-scope figure is approximately $33 billion, and the avoidable-carbon figure is approximately 14.75 MtCO₂e.

Two additional labels matter throughout this chapter. First, realized market flow versus monetized externality: approximately $16.8B of the gross figure is realized market flow (housing sales, energy bills, retrofit contracts, reclaimed-material sales); the remaining ~$20B is monetized externality priced at agency shadow values (EPA social cost of carbon, DEP avoided-cost of CSO, USFS iTree ecosystem services). Stripping shadow prices reduces the headline accordingly. Second, jobs are reported as approximately 150,000 across the six strategies; the per-strategy job figures each carry their own uncertainty band and are discussed strategy-by-strategy below.

Cross-strategy roll-up

Summed across all six strategies, New York's circular-economy opportunity reaches $36.8B in annual value, 15.68 MtCO₂e in annual carbon abatement, and 151,453 durable jobs. The Ellen MacArthur Foundation found €575B across its seven-country study; scaled by NYC's fraction of global built-environment activity (~1.3%), the implied NYC share of the Ellen MacArthur framework is approximately $8B. Our bottom-up NYC-specific quantification exceeds that figure by more than 4×. Two reasons account for the gap: (1) NYC has an unusually high electricity cost, inflating Strategy B solar value; (2) NYC has an unusually dense and old office stock, inflating Strategies A and E. Both are real and durable features of the market, not artifacts.

Strategy detail

Abstract

The first five chapters of this report establish an empirical case. New York City holds over one million buildings and 357 megatonnes of embedded embodied carbon. Its stock is durable, its waste budget is dominated by construction debris, and the circular-economy opportunity identified by the Ellen MacArthur Foundation's six-strategy framework is worth $36.8 billion per year when applied to the local market. Chapter 5 established the positive. Chapter 6 establishes the negative — the measurable obstacles that stand between the opportunity and its realization, class by class, with sources and data gaps noted in place.

We catalogue 22 barriers across six classes, following the methodology set out in Ellen MacArthur Foundation, Building Prosperity (July 2024). The classes are regulatory, financial, skills and labor, knowledge and data, supply chain, and cultural and institutional. Each barrier is rated on two axes: severity (how strongly it blocks circular outcomes) and addressability (how tractable it is within a reasonable policy window). Where the annualized dollar cost can be derived from public data, we disclose it; where it cannot, we say so. The headline number of this chapter — $5.74B per year — is a floor, not a ceiling. It counts only those three barriers for which a dollar figure is directly computable from published sources.

Three empirical patterns recur across the six classes. First, the binding constraints are not cultural — they are capital-structure constraints. Eighty-two billion dollars of LL97-covered retrofit capex must be raised against a policy instrument (LL97) whose first-order penalty is a small fraction of that capex number. Second, the public-data infrastructure that would support circular decision-making is systematically incomplete: 95% of NYC demolition permits report zero floor area, a single finding that vitiates most downstream material-flow analysis. Third, the supply-chain and labor infrastructure that Portland, OR built deliberately over ten years does not yet exist in New York: 3 operational reuse warehouses, fewer than ten deconstruction contractors, and a traditional-preservation craft pool measured in dozens rather than hundreds.

The tone of this chapter is empirical. Where the data returns an answer, we report it. Where the data does not exist — and the absence of the data is itself the barrier — we say so. The object is to name the obstacles precisely enough that Chapter 7's recommendations can speak to each of them by name, without retreating into generalities.

A note on annualization. Annualized dollar figures in this chapter use a mix of stock and flow conventions. Code-uplift capex ($35/sqft × 30M sqft = $1.05B) is a stock figure presented as a one-time-amortized-annual equivalent over a ten-year retrofit window. Externality losses ($4.16B) are true annual run-rates. LL97 penalty exposure ($0.9B) assumes constant-capacity compliance against 2030 targets. The $82B LL97 retrofit capex stack is a one-time unfunded wall, not an annualized flow, and is reported as such.

Executive summary

Six chapters of this report have each measured a single feature of New York's built environment — its stock, its flows, its durability, its waste, its strategies, and its barriers. This seventh chapter closes the loop. Every preceding chapter ends with a number; this chapter turns each number into a named actor, a quantified target, and a horizon by which the action must be visible. It is the report's policy chapter, but more usefully it is its contract: a list of twenty commitments that, if enacted in parallel, would carry New York from its current 19.2% municipal diversion rate to the EU's 2035 benchmark of 65%, and would capture the $36.8 billion of annual circular-economy value that Chapter 5 documented.

The underlying arithmetic is not new. Chapter 1 recorded 1,076,507 buildings and 5.73 billion square feet of floor area holding 357 MtCO₂e of embedded embodied carbon — approximately seven years of the city's operational emissions, frozen in place. Chapter 2 put the annual metabolic throughput at 55.5 Msf of new construction and 30.0 Msf of demolition, producing 4.16 MtCO₂e / yr of new embodied carbon from NYC building activity. Chapter 3 showed that 98.8% of NYC's 818,108 existing buildings are still standing: on current demolition hazards, the city's standing stock would take decades to turn over — no cohort reaches its median lifetime within the 37-year observation window — a durability profile that tells the construction industry it is designing to a fraction of what it already delivers. Chapter 4 quantified the city's waste stream. Chapter 5 translated the six-strategy framework adapted from the Ellen MacArthur Foundation (see Chapter 5 Methodology) into the $36.8B per year figure. Chapter 6 catalogued the regulatory, financial, market, and skill barriers that have kept NYC below its potential.

The recommendations that follow are conservative in each attribution. The $9.11B of annual benefit assigned to the twenty actions below is the directly attributable share of the full $36.8B opportunity — the portion the named actors can be reasonably said to deliver through the specific mechanisms named. It does not double-count, and it does not claim credit for co-benefits that would accrue to bystanders. The remaining share — roughly three-quarters of the total opportunity — flows from market activity that the recommendations enable but do not themselves execute: developer investment in conversions, tenant-initiated retrofits, grid-scale avoided emissions. The relationship between the two figures is the standard relationship between policy and market: policy sets the conditions, the market fills the volume.

Four observations organize the twenty actions. First, the City-government tier is the heaviest-lift because New York's building sector is primarily governed by municipal instruments — DOB permits, DCP zoning, DSNY contracts, LPC approvals, LL97. Eight of the twenty recommendations sit with city agencies. Second, state and federal action remains essential but narrower: five recommendations, mostly closing data and capital-market gaps. Third, industry and capital make the remaining seven recommendations and are the tier most likely to move without a regulatory trigger — they are the places where the economics are already plausible. Fourth, the timeline is short. All twenty actions are scheduled to be visible by 2030, the start of Local Law 97's second compliance period; the remainder of the roadmap through 2050 is the carry-through monitoring and expansion phase.

The chapter is deliberately prescriptive. Each recommendation specifies a verb, an instrument, a threshold, a date, and a responsible office. The Ellen MacArthur Foundation's 2024 report closed with a seven-country framework; this chapter closes with a five-borough implementation schedule. Where the global framework describes what a circular built environment looks like, the implementation schedule describes who must sign which order by which Friday. The difference between the two documents is a difference of resolution, not of ambition.

Two framing choices merit disclosure. First, no recommendation in this chapter is budget-neutral in the short run; every city action below carries either an administrative-staffing burden at an agency, a capital-planning draw on the Mayor's four-year plan, or a revenue-side implication through tax expenditure. These costs are small relative to the opportunity — the full administrative overhead of enacting all eight Tier 1 actions is estimated at roughly 40 FTE over the full 2026–2030 rollout, of which 12–16 FTE are needed in the first 90 days, distributed across DOB, DCP, DSNY, LPC, HPD, and the Mayor's climate office — but they are real and must be scored against the benefits reported below. Second, the opportunity figures here are expressed in 2026 USD at a five-year policy horizon, with the exception of the 2030 counterfactual which is explicitly cumulative. We use nominal rather than discounted figures because the social-cost-of-carbon component is already an externality-adjusted figure at the EPA 2023 $190/tCO₂e update; adding a further discount rate would double-count the time preference.

When to act — 2026 → 2050

The twenty recommendations distribute across four horizons. The 2026 horizon is the set of actions that should be visible by the end of the current fiscal year; the 2027–2030 horizon aligns with the second compliance period of Local Law 97; the 2030–2035 horizon is the EU diversion-parity horizon; the 2035–2050 horizon is the net-zero runway.

Investment ladder

The six Chapter-5 strategies have very different capital intensities. Retrofit (Strategy D) requires on the order of $82 billion of deployed capex to deliver its $10.4B/yr return — a dense, bankable ratio. Material-efficient design (Strategy C) requires near-zero incremental capex to deliver $1.7B/yr of carbon and material value, but does so by redistributing existing construction spend rather than attracting fresh capital. Deconstruction (Strategy F) requires modest infrastructure investment but depends on a labor-training runway. The investment ladder below displays each strategy as a capital-vs-return point and is the single chart every institutional allocator should study before committing to any of these actions.

Peer-city benchmarks

New York's 19.2% current municipal diversion rate is a useful reference only against a peer cohort. Amsterdam, Copenhagen, Paris, and San Francisco each operate with diversion benchmarks two to three times higher, and each has a policy architecture that NYC can learn from without importing wholesale. The EU 2035 directive mandates 65% municipal diversion across member states; this chapter takes that line as the city's 2035 target.

The matrix

The complete recommendation matrix. Every row is a named actor, a quantified target, an estimated annual benefit, a carbon impact, an employment figure, and a cross-reference back to the Chapter-5 strategy and the prior chapter that supplied its evidence base. Rows are sorted by tier, then by estimated benefit.

Attributable totals reflect the portion of each strategy's opportunity that the named actors directly deliver. The full Chapter-5 opportunity of $36.8B per year includes market-driven capture that these recommendations enable but do not themselves execute.

The matrix reads three ways. Read vertically by tier, it is a distribution of administrative responsibility — who signs what order. Read horizontally by strategy reference, it is a distribution of the Chapter-5 opportunity — which dollars each policy unlocks. Read diagonally by horizon, it is an implementation schedule — the order in which instruments must fall into place so that each one arrives with the preconditions it needs. A reader using the CSV can sort on any of these three axes; the canonical presentation above is the tier-then-benefit sort because it is the presentation most legible to the Mayor's and Comptroller's offices during budget negotiation.

First 90 days

The Mayor's office can act on a subset of the matrix immediately, without state, federal, or legislative action. Four recommendations sit on the 2026 horizon and require only executive direction: DOB rule-making to require audit and floor-area publication on DM permits, DSNY commercial-tonnage reporting, LPC fast-track guidance for adaptive reuse, and a foundation program-related-investment (PRI) commitment from a named anchor institution, backstopping the first reuse-hub site acquisition. Together, these account for roughly $0.65B of annual benefit and 5,510 jobs — a first-quarter policy agenda that is fully within the executive's current authority.

Concretely, the ninety-day agenda divides into four administrative workstreams. The first is a DOB rule-making package (T1.1) drafted by the commissioner's office, requiring a pre-demolition material audit and a published floor-area figure on every DM filing. The draft rule can be issued through the agency's normal public-comment process under the City Administrative Procedure Act; the ninety-day target is for publication and opening of the comment window, not for final adoption. The second is a DSNY administrative order to BIC-licensed private carters (T1.4) requiring quarterly tonnage reporting by commercial waste category, executable under existing BIC rule-writing authority. The third is an LPC Commissioner's instruction to staff (T1.6) establishing the 30-day review latency target for Certificates of No Effect on qualifying adaptive-reuse filings. The fourth is a foundation program-related-investment (PRI) commitment (T4.2) from a named anchor institution, backstopping the first reuse-hub site acquisition and signaling capital readiness to downstream tiers.

None of these four actions requires Council approval; none requires state legislation; none requires federal coordination. All four can be substantially complete within the first ninety days of fiscal 2027. The combined institutional cost is an estimated 12–16 FTE across the four agencies, fundable within existing operating budgets and the Mayor's discretionary allocation. The combined first-year benefit — even before any downstream market response — is quantified above. The policy window is short: ninety days is the period in which the arithmetic of beginning is cheaper than the arithmetic of deferring.

If nothing changes

Every recommendation in this chapter is optional. The city can choose not to enact the DOB audit rule; the state can choose not to require carter parity; the federal government can defer WBLCA. The question is what the cumulative cost of those choices is, expressed as embodied carbon and as foregone economic activity. The counterfactual below answers it.

Between 2026 and 2030, status-quo inertia locks in approximately 20.8 MtCO₂e of new embodied carbon from NYC construction that would have been avoidable under the recommendations path. In economic terms, the foregone circular-economy value is approximately $173.1B over the same five-year window — the implied cost of deferring the actions in this chapter by a single compliance period. These are conservative figures: they do not include the operational emissions of the new stock, the avoided PACE origination, the foregone apprenticeship pipeline, or the avoided-penalty cash flow from LL97 non-compliance.

The counterfactual is the chapter's most useful reading frame. Every recommendation above is an attempt to bend one line on this chart toward the other. The Mayor's office need not believe every figure to make the comparison instructive; the two curves diverge even under adoption rates a quarter of those modeled here. The shape of the divergence is the policy argument. Its magnitude — roughly 21 MtCO₂e of avoidable embodied carbon and $173B of deferred value in a single five-year window — is what makes this chapter's twenty actions something other than a research wish list.