R10A Zoning District — New York City

Of every designation profiled in this batch, this one records the oldest median construction year — 1912 — and the highest prewar share, at 85%. The 1945-to-1975 postwar boom barely registers on this file, contributing just 8% of the recorded stock, while construction since 2000 adds a further 3%. That combination — an overwhelmingly prewar file with almost no boom-era layer at all — sets this designation apart from the other elevator-building designations profiled alongside it in this batch, several of which carry a real boom-era share.

Sixty-three percent of these roughly 820 lots also carry historic-district status — the highest overlap of any designation in this batch — meaning landmark review sits on top of the zoning for a clear majority of this file's parcels. By recorded building class, elevator apartment buildings lead at 43%, walk-up apartment buildings follow at 24%, and condominiums add 10%. Land use runs a related pattern: multi-family elevator use leads at 41%, mixed residential-and-commercial use follows at 21%, and multi-family walk-up use adds 19%.

Ninety percent of these lots are coded residential, and the file counts 39,783 units on record — a large total consistent with the elevator-building classes that dominate the file. Height stays tall despite the old recorded construction dates: a median of 6 stories, with 49% of the recorded stock rising above 6 floors. Lots run to a median of 5,021 square feet, with the 90th percentile reaching 16,066 square feet.

Just 2% of these lots sit inside the mapped federal flood zone, a small share alongside the substantial historic-district overlap already noted. Floor-area headroom shows up on 69% of lots, with a median residual of 5 FAR — a wide absolute gap, though smaller in share than several other designations in this batch. The specific allowance behind that figure, along with its citation, is in the rules tables above.

The combination of the oldest median construction year in this batch, 1912, and the thinnest boom-era share, 8%, describes a designation whose defining stock was essentially finished before the 1945-to-1975 postwar boom even began, and largely left alone since — just 3% of buildings have gone up since 2000. That timeline pairs with the heaviest historic-district overlap of any designation in this batch, described above, and with a height record that stays tall despite the old build dates. Read against the 69% of lots recording headroom at a 5 FAR median residual, the recorded capacity here sits on some of the oldest, most consistently reviewed parcels found anywhere in this batch.