Learn NYC Zoning

Core concepts

• What Is FAR? Floor Area Ratio in NYC Zoning, Explained

  Floor area ratio (FAR) is New York City's primary control on building size. What it is, how it's defined in the Zoning Resolution, and how to read it.

• Built, Maximum & Residual FAR — Reading a Lot's Development Headroom

  How built FAR, maximum FAR, and residual FAR relate, why residual FAR approximates development headroom, and what can change the governing maximum.

• Buildable Square Footage in NYC: Why It's Not FAR × Lot Area

  Maximum FAR times lot area is a ceiling, not a buildable figure. The envelope rules, program constraints, and site facts a real NYC buildability analysis checks.

• Transfer of Development Rights (TDR) in NYC: How Unused FAR Moves

  Zoning-lot mergers, landmark transfers under ZR § 74-79, and why unused floor area has market value in New York City.

• The Sky Exposure Plane: NYC's Invisible Ceiling, Explained

  What a sky exposure plane is under ZR § 12-10, how it produces New York's stepped 'wedding cake' buildings, and how it differs from contextual height limits.

• NYC's Sliver Law (ZR § 23-692): Why Narrow Lots Can't Go Tall

  The sliver law restricts the height of narrow buildings in certain higher-density NYC residence districts. What it targets, how it works conceptually, and who should check it.

• Inclusionary Housing & MIH in NYC: Bonus Floor Area for Affordability

  How New York City's Mandatory Inclusionary Housing program and the voluntary inclusionary bonus (§ 23-154, Appendix F) tie floor area to affordable housing.

• Special Purpose Districts in NYC Zoning: Bespoke Rules on Top of the Map

  New York City layers dozens of special purpose districts over its base zoning. What they are, how they modify underlying district rules, and how to check a lot.

• Yards in NYC Zoning: Front, Side & Rear — and Why They Bind

  What front, side, and rear yards mean in NYC zoning, how yards differ from setbacks, and why required open ground can bind before floor area does.

• Setbacks, Street Walls & Base Heights: How NYC Draws Its Streetscape

  How street-wall, base-height, and setback rules in contextual NYC districts produce aligned avenue walls — and what they mean for massing a lot.

• Lot Coverage & Open Space Ratio: The Ground-Level Budgets in NYC Zoning

  Lot coverage caps a building's footprint; open space ratio ties required open area to floor area built. How NYC's two ground-level budgets shape buildings.

• Height Factor Zoning: The Mid-Century Math Behind Towers on Lawns

  How the height-factor regime ties FAR to open space ratio in NYC's non-contextual residence districts, and why it built slab towers on superblock lawns.

• Tower Rules in NYC: How Slender Height Becomes Legal

  In the highest-density NYC districts, tower rules swap sky-exposure geometry for lot-coverage limits. What a tower is in zoning terms, and what disciplines it.

• The Quality Housing Program: Contextual Buildings by Recipe

  What NYC's Quality Housing program is: a bulk regime pairing FAR with fixed heights and street walls, plus building standards — and where it is mandatory.

• Corner, Through & Interior Lots: Why Block Position Changes the Rules

  NYC zoning classifies lots by street frontage — interior, corner, through. How the classification changes yards, coverage, and what a lot can lawfully hold.

• Zoning Lot vs Tax Lot: Two Maps of the Same Land

  The tax lot is the Department of Finance's billing unit; the zoning lot is what the Zoning Resolution measures. Why they diverge, and what that does to FAR math.

• Zoning-Lot Mergers: The Paperwork That Moves Floor Area

  How adjacent NYC tax lots merge into one zoning lot by recorded agreement — parties in interest, ZLDAs, and what diligence has to check before relying on FAR.

• Split Lots: When One Zoning Lot Sits in Two Districts

  District boundaries cross lots more often than expected. How split-lot rules apportion floor area and envelope by portion, and why exact geometry matters.

• ULURP, Explained: How NYC Decides Its Big Land-Use Questions

  The Uniform Land Use Review Procedure is NYC's charter-mandated public review for major land-use actions. The sequence, the clocks, and why the gate matters.

• Variances vs Special Permits in NYC: Two Kinds of Permission

  A variance forgives what zoning forbids on hardship grounds; a special permit grants what zoning offers on conditions. Why the difference matters on a lot's record.

• As-of-Right Development: NYC's Most Valuable Zoning Status

  As-of-right projects comply with every applicable rule and need no discretionary approval. Why that certainty is the central variable in NYC development.

• Rezonings in NYC: How the Map Actually Changes

  Zoning map amendments — city-initiated or private — run through ULURP and leave durable records. How rezonings work and what they mean for a lot.

• CEQR & Environmental Review: The Study That Travels With Approvals

  City Environmental Quality Review is NYC's implementation of state environmental law: what EAS and EIS documents are, and what they mean for projects and lots.

• Landmark Designation & Review in NYC: The Layer Above Zoning

  How LPC designation works, what it restricts, and how landmark review interacts with zoning — including the development-rights consequences of a frozen site.

• From Filing to Permit: How NYC Construction Approval Actually Works

  The Department of Buildings sequence — application, plan review or professional certification, permit, inspections, sign-off — and what its records reveal.

• TCO vs Certificate of Occupancy: Temporary Is a Legal Status

  A TCO lets a building be occupied before final sign-off; a final C of O closes the record. Why the difference matters to buyers, lenders, and analysts.

• Local Law 97: NYC's Building Emissions Law, Explained

  LL97 caps greenhouse-gas emissions for larger NYC buildings, with limits that tighten by period and annual penalties above the cap. What owners should understand.

• LL84 Benchmarking & Energy Grades: The Building's Public Report Card

  Local Law 84 makes larger NYC buildings report annual energy and water use; the letter grades in lobbies follow. What the data shows and how to read it.

• FISP (Local Law 11): NYC's Façade Inspection Regime, Explained

  Why taller NYC buildings must have their façades inspected on a recurring cycle, what SAFE, SWARMP, and UNSAFE mean, and how to read a building's filing history.

• HPD Registration: The Rental Building's Legal Identity Card

  NYC rental buildings must register annually with HPD, naming owners and managing agents. What registration does, and what its absence signals about a building.

• HPD's Alternative Enforcement Program: The List No Owner Wants

  AEP designates NYC's most distressed multifamily buildings for intensive enforcement — inspections, city repairs billed to the owner, and liens. How it works.

• ECB, OATH & DOB Violations: Reading NYC's Enforcement Tracks

  NYC building enforcement runs on parallel tracks — agency violations and adjudicated summonses. What each means, how they resolve, and how to read the counts.

• Elevators, Boilers, Gas & Garages: NYC's Recurring Inspection Regimes

  Beyond façades, NYC buildings run on periodic compliance cycles — elevator tests, boiler filings, LL152 gas inspections, parking-structure checks. How to read them.

• NYC Property Tax & Assessment: How a Lot's Bill Actually Gets Made

  Tax classes, market and assessed values, transitional values, and the certiorari challenge path — the machinery behind every NYC property tax bill.

• FEMA Flood Zones in NYC: What Being 'In a Flood Zone' Actually Means

  SFHA status is a mapped, parcel-specific, legally consequential fact — and NYC's maps have their own history. How to read flood-zone designations honestly.

• Base Flood Elevation & Freeboard: The Vertical Dimension of Flood Risk

  Two lots in the same flood zone can face very different risk. BFE, freeboard, and why elevation — not zone status — separates neighbors in a flood.

• Flood Maps vs Flood History: A Model Is Not a Memory

  The flood map models risk; the loss record documents it. Why the two disagree, what each is good for, and how honest flood analysis uses both.

• Why 'No Violations on File' Doesn't Mean 'Compliant'

  Municipal records document encounters with enforcement, not the absence of problems. How to read clean-looking records honestly — and when absence is a finding.

• Brownfields, (E) Designations & Cleanup Programs: Reading a Lot's Ground

  How contamination surfaces in NYC property records — E-designations, cleanup-program enrollments, historic uses — and what each marker actually means.

• Petroleum Tanks & Spill Records: The Fuel History Under NYC Lots

  Registered storage tanks and state spill files are the paper trail of a lot's fuel history. How to read tank status, spill numbers, and their silences.

• Buying & Selling Air Rights in NYC: How the Deals Actually Work

  Air-rights transactions run on zoning arithmetic, adjacency, and recorded instruments. The deal mechanics — pricing, counterparties, documents, diligence.

• Assemblage in NYC: Building a Development Site Lot by Lot

  Assemblage combines adjacent lots into a development site — pooling floor area, escaping small-lot rules, and negotiating block-by-block. How it reads in records.

• Ground Leases in NYC: When the Building Doesn't Own Its Land

  Under a ground lease, one party owns the land and another owns the building on it. How the structure works, why it exists, and what records reveal.

• Rent Stabilization: What the Records Show (and What They Don't)

  Rent stabilization is a per-unit legal status that public records reveal only partially. How registration counts, building facts, and law changes read together.

• Opportunity Zones in NYC: A Tax Map Overlaid on the Property Map

  Qualified Opportunity Zones are census tracts carrying federal capital-gains incentives. What designation means for a lot, and what it doesn't.

• NYC Tax Exemptions & Abatements: The Incentive Stack on a Building's Bill

  From 421-a and its successor 485-x to J-51's renovation lineage and ICAP — how NYC's property-tax incentives work, expire, and read in records.

• What a Deed Actually Proves — and What It Quietly Doesn't

  A recorded deed evidences a conveyance: parties, date, stated consideration. Why the 'sale price' needs context and what recording does and doesn't guarantee.

• Publication Lag: Why Every Municipal Record Is Slightly Out of Date

  Events happen, then records publish — days to weeks later, dataset by dataset. Why as-of dates matter and how honest analysis wears the lag.

• Who Owns This Building? LLCs, Entities & the Records That Answer

  Most NYC buildings are owned by entities, not people. The public records that connect companies to accountable humans — and the honest limits of the exercise.

• How to Read a NYC Property Record: Evidence, Not Truth

  A property's public file is layered, lagged, and partial — and still the best instrument there is. The reading discipline that turns records into analysis.

Glossary

206 working definitions of the acronyms and terms of art that NYC property records assume you already know — BBL, FAR, ULURP, air rights, as-of-right, and the rest.

Browse the glossary →

In progress

Guides to the City of Yes zoning changes — housing opportunity, economic opportunity, and carbon neutrality — are in progress.