C6-3X Zoning District — New York City

This designation covers roughly 83 tax lots on record, a modest footprint, with a stock that is substantially prewar: 74% of recorded buildings predate 1940 and the median construction year is 1920. The 1945-to-1975 boom contributed 10% of the stock, and construction since 2000 adds another 9% — both minority shares against buildings that mostly arrived earlier. Those two later-era shares sit close together, 10% and 9%, unlike some designations where one clearly outweighs the other. That layering — a substantially prewar core with two thin but nearly matched later-era shares — describes a designation whose building timeline steadied rather than accelerated after the war.

Condominium classifications lead the decodable building classes at 16% of the recorded mix, with mixed residential-commercial buildings at 13%. By land use, mixed residential-and-commercial use covers 55% of lots and commercial-and-office use another 24%, with multi-family elevator buildings at 6%. Residential use overall reaches 65% of lots, and the records count 3,115 homes across the designation — a moderate population for a designation of this size.

Lots run to a median of 3,391 square feet, with the 90th percentile considerably larger at 21,231 — a wide spread between the typical parcel and the largest ones on record. Buildings rise to a median of 5 stories, with 33% recorded above 6 floors. A recorded 2% of lots carry a historic-district designation, and 0% sit inside the mapped Special Flood Hazard Area, leaving flood exposure entirely off the map here. That contrast in lot size, alongside the near-total absence of mapped flood risk, sets the ground conditions against which the recorded development gap below plays out.

The development ledger here is unusual in combining breadth with depth: 86% of lots record some floor area below their allowance, and the median residual itself is substantial, at 5.1 FAR — a wider recorded gap than a lot fabric this size might suggest. The rules tables above carry the governing FAR and height figures with their citations, and each lot's own recorded floor-area detail is held at the individual tax-lot level across this small set.

No stat family in this designation's file comes back nulled for coverage; every measure here reflects a complete count rather than a partial one. That matters because the combination recorded here — broad headroom at 86% of lots paired with a comparatively large median residual of 5.1 FAR — sits alongside a stock that is 74% prewar and only modestly sized at 83 lots. Each lot's own recorded floor-area and historic status is tracked lot by lot across the full set.