Air Rights and Development Rights Transfers in New York City

Unused development rights, often called air rights, can be moved from one lot to another when the lots are merged into a single zoning lot. The Land Law Firm represents buyers and sellers in these transactions and drafts the Zoning Lot Development Agreements (ZLDAs) and declarations that make them work.

A development rights deal is part real estate contract and part zoning filing. The documents have to satisfy both the parties and the Department of Buildings.

How a zoning lot merger works

Under ZR 12-10, a zoning lot can include several adjoining tax lots. Once merged, the zoning lot is treated as one site: its total allowable floor area can be distributed among the tax lots as the owners agree. A seller with an underbuilt building can transfer its unused floor area to a neighbor, as long as the lots are contiguous for at least ten linear feet and the merger is properly recorded.

The documents

  • Zoning Lot Development Agreement (ZLDA): the contract between the owners that allocates floor area and governs how each lot can be developed going forward.
  • Declaration of Zoning Lot Restrictions: the recorded instrument that merges the tax lots into one zoning lot.
  • Zoning Lot Description and Ownership Statement, and waivers or consents from every party in interest, including mortgage lenders.
  • Light and air easements, where a buyer needs to protect windows or lot line conditions.
  • Purchase and sale agreements for the development rights themselves.

Issues we negotiate

  • Exactly how much floor area is transferred, and how it is calculated if the zoning changes before the buyer builds.
  • Restrictions on the seller's future development, and what the seller keeps.
  • Cooperation covenants for DOB filings, construction access, and future zoning changes.
  • Indemnities, insurance, and access terms during construction next door.
  • Lender consent and subordination on both sides.
  • Treatment of prior mergers and older agreements already on title.

Landmark transfers

Landmark buildings have their own transfer rules, which City of Yes expanded in 2024. A landmark can now send development rights to receiving sites within its surrounding area, without a zoning lot merger. See our page on landmark development rights transfers for how that process works.

Frequently Asked Questions

How are NYC air rights priced?

Air rights are usually priced per square foot of transferable floor area. The price depends on the neighborhood, how badly the buyer needs the rights, and the value of the finished building. Sellers should confirm exactly how many square feet are available before negotiating a number.

What is a ZLDA?

A Zoning Lot Development Agreement is the contract between owners of merged tax lots. It allocates the zoning lot's floor area between them and sets the rules for future development on each lot, including cooperation on filings and restrictions on the seller's site.

Does my lender need to sign a ZLDA?

Usually, yes. Mortgage lenders are parties in interest under ZR 12-10, so each must sign the declaration or waive its right to do so. Lender sign-off is often the longest lead item in a development rights closing.

Can air rights be transferred to a lot across the street?

Not through an ordinary zoning lot merger, which requires the lots to adjoin. Landmark buildings are the main exception: under the City of Yes rules, a landmark can transfer development rights to receiving sites within its surrounding area, which does not require the lots to touch.

Related Practice Areas

Landmark Development Rights TransfersTransferring unused development rights from NYC landmarks under the City of Yes rules: CPC certification, bulk authorizations, and special permits.Zoning Analysis & Due DiligenceSite-specific NYC zoning analysis, as-of-right development yield, zoning opinions for closings and lenders, and zoning due diligence for acquisitions.ULURP RezoningsPrivate rezonings in NYC through ULURP and the new expedited ELURP process, from the IIM and PAS through City Planning and City Council approval.

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