NYC Zoning Handbook:
Residential Districts: R4-1

R4-1 districts and R3-1 districts are similar, both are limited to single- and two-family detached and semi-detached houses. The R4-1 district, however, generates larger houses on smaller lots because of its narrower lot requirements for detached residences, and the 50 percent increase in FAR to 0.75 (plus an attic allowance of up to 0.15 FAR). Zero lot line buildings that abut one side lot line are also permitted. Portions of Baychester in the Bronx and Bayside in Queens are examples of R4-1 districts.

In order to maintain the streetscape, the front yard of a house 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. Any part of a building that is higher than 25 feet is usually set back or under a pitched roof. One parking space is required for each dwelling unit.

Basic Data

R4-1: Single- or two-family residences, detached or semi-detached

Minimum lot size:
Detached: 2,375 square feet lot area; 25 foot lot width
Semi-detached: 1,700 square feet; 18 foot lot width
Maximum FAR: 0.75 plus 0.15 attic allowance
Maximum lot coverage: controlled by yards
Minimum lot area per DU: 970 square feet
Maximum DUs per acre: 45
Front yard: 10 feet minimum
Side yards:
Detached (2 required): 8 feet total (minimum)
Zero lot line (I required): 8 feet minimum
Semi-detached (1 required): 4 feet minimum (8 feet minimum between buildings)
Maximum building height: 35 feet; perimeter wall height: 25 feet
Required parking: One space per dwelling unit

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