R3-1 Zoning District — New York City

Of the ten low-rise designations profiled in this stretch of the map, this one carries the newest median construction year: 1965, squarely inside the 1945-1975 postwar boom rather than before it. That boom accounts for 40% of the recorded stock, the largest postwar share in this batch, while only 26% of buildings predate 1940 — the reverse of the prewar-heavy pattern that dominates several of the neighboring designations. Recent construction has added a further 10% since 2000, meaning this designation has kept building in every era the records track rather than settling into a single wave the way some of its older-dated neighbors have.

The designation is mapped across roughly 50,000 tax lots citywide, a sizable footprint for this bracket, though smaller than the largest designations profiled alongside it. One-family homes lead the recorded building classes at 59%, with two-family homes at 31% and vacant land at 4% — still a single-family-dominant mix, if less concentrated than some of its neighbors. Land use follows closely: one- and two-family use covers 91% of lots, with vacant land at 4% and multi-family walk-up use at 3%. Overall 94% of lots are coded residential, and the file counts 71,995 homes across the designation, a large recorded population for a stock this age.

Flood exposure sets this designation apart from the rest of this batch: 13% of these lots sit inside the mapped federal flood zone, the highest share recorded among the ten designations profiled here. That is a statement about the federal flood map, not a record of which individual lots have actually taken on water — and it is always checkable against any single lot's own page. None of this designation's recorded stat families are marked as nulled for coverage, so this flood share, like every other figure here, draws on a complete read of the file.

Lots here run smaller than some of the more spacious designations in this bracket: a median of 2,825 square feet, with the 90th percentile at 5,000 square feet. Buildings rise to a median of 2 stories, and 0% of recorded buildings climb above 6 floors. On the development side, 71% of lots record floor area below their allowance, with a median residual of 0.2 FAR — real but comparatively narrow room, on a stock already built out closer to its recorded capacity than several of its neighbors show. What the zoning actually permits on any lot carrying this designation — floor area, height, all of it — is laid out with citations in the tables above; this page describes only what the records show already standing.