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Guide

How to run an as-of-right zoning study in NYC

An as-of-right zoning study answers one question: what can be built on this lot today, without discretionary approvals? Here’s the full workflow — the same steps a zoning consultant runs, and how to compress them into seconds.

1. Identify the zoning district (and every overlay)

Start with the property’s zoning district — the R, C, or M designation that sets the ground rules. Look it up on the city’s ZoLa map or from PLUTO. The district alone isn’t enough: commercial overlays, special-purpose districts, and mandatory inclusionary-housing areas all change what’s allowed.

Note the lot’s key physical facts too — lot area, frontage, whether it’s a corner or through lot, and the width of the streets it faces. Street width in particular can change the applicable FAR and height under several NYC rules.

2. Pull the controlling bulk rules

For the district, gather the maximum Floor Area Ratio (FAR) for each use — residential, commercial, and community facility — along with height limits, setback and sky-exposure-plane requirements, yard and court rules, and any lot-coverage cap.

This is where NYC gets hard: the binding constraint is often not FAR but a height, setback, or yard rule that keeps you from ever reaching the maximum floor area. A real study has to test all of them at once.

3. Compute the maximum buildable floor area

Multiply the lot area by the applicable FAR to get the base maximum zoning floor area. Then adjust for the programs the lot qualifies for — Quality Housing, inclusionary housing bonuses, City of Yes provisions, or transferable air rights from an adjacent lot.

  • Base floor area = lot area × FAR (per use).
  • Add qualifying bonuses (inclusionary housing, City of Yes, community-facility floor area).
  • Add transferable development rights (air rights) if an assemblage or adjacent donor lot applies.
  • Subtract anything the physical envelope won’t actually let you build.

4. Build the massing and test the envelope

Numbers aren’t a building. Fit the floor area into a physical massing that respects height limits, setbacks, sky-exposure planes, and required yards and courts — then check whether you can actually pack the permitted FAR into that envelope. On many lots you can’t, and the real as-of-right number is lower than the raw FAR math suggests.

A good massing study also produces a typical-floor plan and a realistic unit mix, because that’s what determines whether the project is worth building.

5. Turn capacity into a decision

The point of the study isn’t the square footage — it’s the decision. Compare the as-of-right scenario against bonus scenarios, estimate value using an income or sales approach, and run a quick pro forma to see whether the site pencils.

The fast path

Doing this by hand takes a consultant hours to days per lot. Envelope encodes the NYC Zoning Resolution and does all five steps automatically: enter an address and get the district and overlays, the as-of-right FAR and buildable square footage, a 3D massing with typical-floor sketch plans, City of Yes and bonus scenarios, and an income-approach valuation — in seconds, starting at $149 per report with no subscription.

Frequently asked

What does “as-of-right” mean in NYC zoning?

As-of-right means the development is permitted under existing zoning without any discretionary approval — no variance, special permit, or rezoning. If a project fits the district’s use, bulk, height, and yard rules, it can be built as-of-right.

How do I find the maximum buildable square footage for a NYC lot?

Multiply the lot area by the applicable FAR for each use, add any bonuses or transferable air rights the lot qualifies for, then confirm the physical envelope (height, setbacks, sky-exposure plane, yards) can actually contain that floor area. The lower of the two is your real buildable area.

Is FAR the same as buildable square footage?

Not exactly. FAR sets the maximum floor area as a ratio of lot area, but height, setback, and yard rules can prevent you from ever building to the full FAR. Buildable square footage is what the envelope actually allows.

How long does an as-of-right zoning study take?

By hand, a consultant may take hours to several days per lot. Automated tools like Envelope produce an architect-grade as-of-right study — including massing and valuation — in seconds.

Run an as-of-right study on your lot

Enter any NYC address and get the district, as-of-right FAR, buildable square footage, a 3D massing with sketch plans, and a valuation — starting at $149, no subscription required.

Run a report — $149 How zoning reports work