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What is NYC ZR § 23-21?

Quick Answer

This section establishes maximum residential floor area ratios for R1 through R5 zoning districts, detailing separate ratios for standard zoning lots and qualifying residential sites. The Department of Buildings enforces these regulations. Applies to building owners in specified residential districts.

General informational summary. Not legal advice for your situation. Consult an attorney before acting on any specific matter.

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§ 23-21 Floor Area Regulations for R1 Through R5 Districts

ZR § 23-21

R1 R2 R3 R4 R5

In the districts indicated, the maximum residential floor area ratio shall be as set forth in the following table. Separate maximum residential floor area ratios are set forth for standard zoning lots and zoning lots that are qualifying residential sites.

MAXIMUM FLOOR AREA RATIO FOR R1-R5 DISTRICTS

District

Standard zoning lots

Qualifying residential sites

R1-2A R1-1 R1-2

R2A R2

R3A R3X R3-1 R3-2

0.751

1.00

R2X

R4A R4B R4 R4-1

1.50

R5A R5B R5

2.00

R5D

1 For standard zoning lots with a lot area of 4,000 square feet or more, the maximum residential floor area associated with any single dwelling unit shall not exceed an equivalent floor area ratio of 0.60.

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