NYC Zoning Handbook:
Residential Districts: R4A

The R4A district is similar to R3A in that it also permits only single- and two-family detached houses. However, it does not allow zero lot line buildings. The higher FAR of 0.75 (plus an attic allowance of up to 0.15 FAR) results in bulkier buildings on lots with a minimum width of 30 feet A section of Bayside in Queens has been designated a R4A district

Any part of a building that is higher than 25 feet is usually set back or under a pitched roof. 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. One parking space is required for each dwelling unit

Basic Data

R4A: Single- or two-family detached residences

Minimum lot size: 2,850 square feet lot area; 30 foot lot width
Maximum FAR: 0.75 plus 0.15 attic allowance
Maximum lot coverage: controlled by yards
Minimum lot area per DU: 1,425 square feet
Maximum DUs per acre: 30
Front yard: 10 feet minimum
Side yards (2 required): 10 feet total
(minimum); 2 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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