Air Rights & Development Sites: What Your Brooklyn Lot Is Worth to a Developer

The Basics

Floor Area Ratio, in Plain Language

Every lot in New York City has a zoning district, and every district has a maximum floor area ratio, or FAR. FAR is simply a multiplier. Multiply your lot area by the FAR and you get the maximum zoning floor area you can build.

A simple example: a 20-by-100-foot Brooklyn lot is 2,000 square feet. If the district allows an FAR of 2.0, the lot can hold about 4,000 square feet of zoning floor area, whether that is two stories covering the whole lot or four stories covering half of it, subject to the district’s height and yard rules.

Why the number is never quite that simple

• Residential, commercial and community facility uses often have different FARs in the same district
• Zoning floor area is not the same as gross square footage; some spaces, like many cellars, are excluded
• In many districts, whether your lot faces a wide or narrow street changes the maximum FAR or height
• Contextual districts common in Brooklyn, like many R6B and R7A areas, cap height and require buildings to line up with the street wall

Where to look it up

The city’s ZoLa map shows your zoning district, any special district or historic district, and your lot dimensions. The city’s property data (PLUTO) estimates your built FAR versus the maximum, which is a quick first read on unused rights. Recorded documents in ACRIS will show if a neighbor already bought some of your lot’s rights years ago, which happens more often than owners expect.

If you want us to run these numbers for you, send the address through our seller form. We will tell you what we see, even if the answer is that your lot has little unused floor area.

Unused Rights

Why Your Brownstone May Be Sitting on Unbuilt Floor Area

Much of Brooklyn was built before modern zoning, so existing buildings rarely match what today’s rules allow. Some are larger than current zoning permits and are allowed to remain as legal non-compliances. Others, like a two-story frame house on a lot zoned for a five- or six-story building, or a garage on a commercial avenue, are well below the limit.

Common Brooklyn examples

• One- and two-story taxpayers and garages on avenues like Atlantic, Flatbush, Fourth and Nostrand
• Small frame houses in areas rezoned for higher density, such as parts of Gowanus after its 2021 rezoning
• Low commercial and industrial buildings on blocks rezoned for housing, such as parts of East New York after its 2016 rezoning
• Corner lots with a short building and a large side yard

When paper rights are not usable

Unused FAR only has full value if someone can actually build it. Height caps in contextual districts, rear yard rules, landmark review, a very narrow lot, an existing building that cannot be demolished practically, or tenants with strong legal protections can all shrink what is realistically buildable. Removing rent-stabilized tenants for demolition requires approval from the state’s housing agency and typically relocation and stipends, which can take years. A good buyer prices what can be built, not just the theoretical maximum. Our page on selling a rent-stabilized building covers that situation.

Transferring Rights

How Air Rights Are Sold: Zoning Lot Mergers and Transfers

In most of the city, development rights cannot be sent to any lot you choose. They move within a single zoning lot, which zoning defines as a tract of land made up of one or more contiguous lots on the same block. That is why your most likely buyer for air rights alone is a neighbor.

Zoning lot mergers

In a zoning lot merger, two or more adjacent tax lots are combined into one zoning lot. The unused floor area of the combined lot can then be used anywhere on it, typically on the developer’s parcel. A merger does not require public land use review. It is completed by recording zoning documents, including a declaration of restrictions, after every party in interest, such as each owner and mortgage lender, consents or waives its rights.

• A zoning lot development agreement sets how the floor area is divided, what you give up and what you are paid
• Agreements often include light and air easements that limit how high future buildings can rise
• The restrictions run with the land, so they bind future owners of your building
• Development rights transfers can trigger transfer taxes, so ask your attorney and CPA about the tax treatment

Landmark transfers and split lots

Individually designated landmarks have long been able to transfer unused floor area to nearby lots through a special process. City of Yes broadened it, allowing receiving sites on the same block and across the street, through a certification process with a cap on how much a receiving site can grow. It also lets floor area shift across a zoning lot divided by a district boundary in some cases. These are technical rules, so confirm eligibility with a zoning attorney.

Policy Changes

City of Yes, Rezonings and What Changed for Brooklyn Lots

The City Council adopted City of Yes for Housing Opportunity on December 5, 2024. It was the broadest zoning overhaul in decades, and a court challenge seeking to undo it was dismissed in November 2025. For landowners, these are the pieces that matter most.

• Universal Affordability Preference. In R6 through R10 districts and their commercial equivalents, outside Mandatory Inclusionary Housing areas, a building can add about 20 percent more floor area, with added height, if the extra floor area is permanently affordable housing.
• Parking. Parking requirements for new housing were eliminated in the most transit-rich areas, including parts of Brooklyn, and reduced in others. Fewer required spaces can make small sites workable.
• Low-density options. Modest apartment buildings over storefronts in some commercial areas, more housing near certain transit, and accessory dwelling units on some one- and two-family lots, with flood zone and historic district limits.
• Conversions. Easier conversion of older non-residential buildings to housing where residential use is allowed.

Neighborhood rezonings

Separate from citywide changes, neighborhood rezonings can multiply what a lot can hold. The 2021 Gowanus rezoning and the Atlantic Avenue Mixed-Use Plan approved in 2025, covering parts of Crown Heights and Bedford-Stuyvesant, both allowed housing at higher densities on blocks that were mostly industrial or auto-related. In November 2025, voters also approved Charter changes intended to speed review of certain affordable housing and modest rezonings, with implementing rules still being written. See our pages on Gowanus and Crown Heights for local context.

We track these changes block by block, which is part of why we can often see value in a lot that a general buyer would miss.

The Math

How Developers Back Into Land Value

Developers rarely start with “what is this lot worth?” They start with “what can we build, and what will it be worth when it is finished?” Then they work backward.

The residual method, step by step

• Design the building: how many square feet and units the zoning really allows on your lot
• Value the finished product: projected rents for a rental, or sale prices for condos
• Subtract hard costs: demolition, foundations, structure, systems and finishes
• Subtract soft costs: architects, engineers, attorneys, permits, insurance and taxes during construction
• Subtract financing and time: interest, fees and the months the site sits before it earns anything
• Subtract required profit: the return that justifies the risk
• What remains is the land value, often compared across sites per buildable square foot

Why two developers offer different prices

Each input is an assumption. One buyer may plan a rental using the 485-x tax incentive, which has different affordability and, for larger projects, construction wage requirements depending on size. Another may plan condos, or a smaller building that avoids elevator and construction-type cost jumps. A buyer with lower costs, faster approvals or a better plan for your specific lot can pay more. That is why you should ask each buyer what they plan to build.

We share the outline of our analysis with owners: the floor area we think is usable and the main assumptions behind our number.

Value Checklist

What Raises and Lowers a Brooklyn Site’s Value

Tends to raise value

• Vacant or easily delivered vacant, with no regulated tenants
• Higher-density zoning, a wide street or a corner location
• Near subway stations, which supports rents and may reduce parking needs
• Adjacent lots available for assemblage
• Clean title, no restrictive declarations and no prior sale of development rights

Tends to lower value

• Rent-stabilized or long-term tenants who cannot be relocated practically
• Historic district review that limits height or bulk
• Environmental conditions or flood-zone construction requirements
• Narrow, shallow or irregular lots
• Open violations, liens or unresolved estate and ownership questions

Many of these are fixable or can be priced. If your site has violations, read our guide on selling a building with violations.

Your Options

Selling, Partnering or Building: Your Real Options

Sell the whole property

The simplest path. You get paid once, at closing, and the buyer takes on approvals, construction and market risk. This is what we do most often, buying lots and buildings as-is with cash.

Sell only the air rights

If a neighbor is building and needs floor area, you may be able to keep your building and sell unused rights. The pool of buyers is usually one or two adjacent owners, so timing matters.

Partner with a developer

Some owners contribute land to a joint venture for a share of the finished project. It can pay more over time, but you take on construction, market and partner risk, and your money is tied up for years. Have a real estate attorney structure it.

Develop it yourself

If you have experience, capital and patience, building yourself captures the most value. Expect years of design, approvals and construction.

List with a broker

For a clean, well-zoned, vacant site, a broker running a competitive process can be the right choice, and we are glad to bid in one. For sites with tenants or complications, a direct sale is often simpler. Our guide to off-market sales explains the trade-offs.

Next Steps

How We Evaluate a Development Site

We buy development land and value-add buildings across Brooklyn, from Red Hook and Sunset Park to East New York. Our process is straightforward.

• You send the address and anything you know about the property
• We review zoning, lot dimensions, recorded documents and building records
• We walk the site and talk through your goals and timing
• We make a written, all-cash offer and explain the main assumptions
• Your attorney and ours handle the contract and closing on your schedule

Before you commit to any sale or air rights deal, get a zoning analysis from an architect or zoning attorney and talk to a CPA about taxes. This guide is general information, not legal, zoning or tax advice. Rules change, so confirm current requirements for your specific lot. See what we buy for the full list.