NYC Zoning Handbook:
Residential Districts: R3A

R3A districts permit modest single- and two-family detached houses on lots that are substantially narrower than in R3-1 districts. It is the lowest density district to allow zero lot line buildings (freestanding buildings that abut one side lot line). R3A districts are characteristic of many of the older sections of the city. Parts of Rego Park and Bellerose in Queens and Eltingville in Staten Island are typical R3A neighborhoods.

The maximum FAR (0.5 plus an attic allowance of up to 0.1 FAR) is the same as in R3-1 and R3-2 districts. Height regulations are the same for all R3 districts; any part of a building that is higher than 21 feet is usually set back or under a pitched roof. In order to maintain the streetscape, the front yard of a house in R3A districts must be at least as deep as one of the adjacent front yards; it must be a minimum of 10 feet deep but need not exceed 20 feet in depth. One parking space is required for each dwelling unit.

Basic Data

R3A: Single- or two-family detached residences

Minimum lot size: 2,375 square feet lot area;
25 foot lot width
Maximum FAR: 0.5 plus 0.1 attic allowance
Maximum lot coverage: controlled by yards
Minimum lot area per DU: 1,185 square feet
Maximum DUs per acre: 37
Front yard: 10 feet minimum
Side yards:
Detached (2 required): 8 feet total (minimum)
Zero lot line (1 required): 8 feet minimum
(8 feet minimum between buildings)
Maximum building height 35 feet; perimeter wall height 21 feet
Required parking: One space per dwelling unit

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