R2A Zoning District — New York City

Of the designations profiled in this batch, this one carries the highest concentration in a single construction era: the median year is 1945, exactly the start of the 1945-to-1975 postwar boom this profile tracks, and that boom era alone accounts for 60% of the recorded stock — the highest boom-era share of any designation in this set. Just 24% of buildings predate 1940, and only 2% have gone up since 2000, meaning this designation's roughly 38,000 lots are, on the record, overwhelmingly a product of one specific two-decade window rather than a blend of several eras.

Building class runs 87% one-family homes, with two-family homes at 9% and vacant land at 1%. Land use matches closely: 96% one- and two-family use, with vacant land and multi-family walk-up use each at 1%. Ninety-eight percent of these lots are coded residential — the highest residential share of any designation in this batch — and the file counts 42,212 units on record across the roughly 38,000 lots carrying this designation.

The lot fabric here is also the tightest recorded in this batch: a median of 4,000 square feet against a 90th percentile of just 5,700 square feet, a narrower range than any other designation profiled here. Buildings sit at a median of 2 stories, with 0% of the recorded stock rising above 6 floors, consistent with the uniformly low-rise, boom-era pattern already shown in the construction record.

Two overlays read at zero here: 0% of lots sit inside the mapped federal flood zone, and 0% carry historic-district status — neither map touches this designation on the current record. Floor-area headroom remains broad: 94% of lots record built area below their recorded allowance, with a median residual of 0.4 FAR, one of the wider recorded headroom shares in this batch. The specific allowance behind that figure, with its citation, is set out in the rules tables above.

A median construction year landing exactly on 1945, the start of the postwar boom this profile tracks, is a different kind of concentration than a designation whose median simply falls somewhere inside that window — it marks this designation's roughly 38,000 lots as having begun their recorded construction essentially at the boom's opening rather than partway through it. Paired with the 98% residential share and the tightest recorded lot range in this batch, 4,000 square feet against a 5,700-square-foot 90th percentile, the picture is of a designation built quickly and almost entirely for housing in a narrow window, with 94% of lots still recording headroom at a 0.4 FAR median residual today.