C4-6A Zoning District — New York City

Height and landmark status coincide unusually often on the roughly 200 lots carrying this designation. The median building rises 7 stories, and 51% of recorded structures climb above 6 floors — a majority, in a file where most designations report that share in the single digits or teens. At the same time, 48% of these lots sit inside a designated historic district, meaning landmark review sits on top of a genuinely tall recorded stock rather than the low-rise blocks where historic designation more commonly appears in this comparison set. Height and landmark protection do not usually travel together in this file; here, on close to half the lots, they do.

The buildings themselves are old. The median construction year is 1919, and 84% of recorded structures predate 1940 — one of the higher prewar shares in the group. Only 2% of buildings fall inside the 1945-1975 postwar boom, the quietest stretch in this district's construction record, while 9% have gone up since 2000. Height this consistent from a stock this old suggests the tall buildings were largely part of the original prewar build-out rather than later additions — a pattern distinct from designations where height arrived mostly in a later construction wave.

By recorded class, elevator apartment buildings lead at 29%, walk-up apartment buildings and condominiums each account for 19%. Land use runs heavily residential in character: mixed residential-commercial parcels hold 64% of lots, commercial and office parcels 17%, and multi-family elevator parcels 12%. Seventy-eight percent of lots are recorded as residential, and the file counts 11,342 units — the largest housing count in this comparison group, on lots running to a median of 5,500 square feet and a 90th percentile of 17,514. That unit total, spread across a designation of only roughly 200 lots, points to buildings that are individually large and densely occupied rather than a stock that achieves its scale through sheer parcel count.

Recorded floor-area headroom is broad but not universal: 75% of lots show built area below their mapped allowance, at a median residual of 4.7 FAR. On a stock this tall and this densely built already, that gap likely sits disproportionately on a smaller set of parcels rather than spreading evenly — the specifics for any one lot are on that lot's own page, which is the only place a single-parcel figure like that can be checked reliably.

Flood exposure is absent from the current record: 0% of these lots sit inside the mapped federal flood zone — a statement about today's federal map, not a claim that the ground has never seen water. For the floor-area and height limits that actually govern any one of these roughly 200 lots, including the ones behind that 48% historic-district share, the rules tables above carry the exact figures with citations, covering both the zoning ceiling and any landmark-review layer that applies on top of it.