C6-1A Zoning District — New York City

This designation is a small one — roughly 11 lots citywide — and unusual among them: the recorded stock is comparatively new, with a median construction year of 1990. None of the recorded buildings date to the 1945-to-1975 postwar boom, a gap of zero that stands out against how common that construction window is elsewhere; 20% of the stock predates 1940, and 10% has been built since 2000. The overall picture is of a designation whose buildings mostly went up in the interval between the boom and the present, a window this profile does not separately track, and one that leaves both eras this profile does track as minorities of the recorded stock. That absence of any postwar-boom construction is itself notable, since that window shows up in some share on nearly every other designation profiled in this set.

By recorded class, office buildings dominate at 73%, with elevator apartment buildings and outdoor recreation facilities each recorded at 9%. Land use runs the same way: 73% commercial and office, with multi-family elevator use and public facilities and institutions each at 9%. Residential use covers only 9% of these lots, and the file counts 77 homes on record — a small residential footprint on a designation built mostly for other uses, consistent with the office-heavy building-class mix above. The remaining recorded classes fall below double digits individually, consistent with a designation built around a small number of larger, single-use sites rather than many smaller mixed parcels.

The lots themselves run large: a median of 42,709 square feet, with the largest lots on record reaching 53,750 square feet, sizable ground rather than narrow rowhouse lots. Height sits at a median of 7 floors, with 70% of the recorded stock rising above 6 floors — tall buildings on large, assembled-looking parcels, a combination that tracks with the office-dominated use recorded above. Large lots and taller buildings recorded together, on a designation this small in lot count, make each individual parcel's file more consequential to the overall percentages than it would be on a bigger designation.

Development records show comparatively little recorded room left on these lots: only 18% carry floor area below their allowance, with a median residual of 0 — a tighter recorded margin than several other designations in this batch, consistent with a stock built more recently and closer to its own recorded line. Neither the federal flood map nor the historic-district layer touches these lots — both read 0% here. That tight margin sits alongside a stock recorded as comparatively new, a pairing that is broadly consistent across the file rather than contradictory. Specific governing figures, with citations, sit in the rules tables above, lot by lot.