C4-3 Zoning District — New York City

This designation's construction record spans genuine eras rather than clustering around one: of the roughly 1,700 lots mapped this way, 63% of recorded buildings predate 1940 and the median construction year is 1931, but the 1945-to-1975 boom contributed a real 10% of the stock, and construction since 2000 has added a further 13% — together nearly a quarter of the recorded buildings postdating the prewar period. That combination reads like a stock that has kept absorbing new construction across several distinct waves rather than filling in once and stopping. Rather than a single generation of builders, the file reads like several: prewar, boom-era, and contemporary construction have each left a real, separately identifiable mark.

By land use, mixed residential-commercial buildings account for 41% of recorded parcels, commercial-and-office uses add 28%, and multi-family walk-up buildings contribute 12% more. Among recorded building classes, mixed residential-commercial structures make up 17% of the stock and walk-up apartment buildings a further 14%. Residential lots make up 61% of the total, and the file counts 11,418 homes across these roughly 1,700 lots — a dense figure that points to sizable multi-unit buildings rather than a stock of small structures spread thin. Spread across this lot count, that total implies several recorded homes on a typical parcel rather than one, reinforcing the multi-unit reading. A recorded 2% of lots also sit inside a designated historic district, a modest but real landmark overlay on top of the zoning.

The lots themselves run a median of 2,500 square feet, with the 90th percentile reaching 10,450 square feet — a moderate spread that allows for some larger assemblages without departing far from a standard urban parcel. Buildings on these lots run to a median height of 3 stories, and 5% of the recorded stock rises above 6 floors, a modest but real share of taller buildings mixed into an otherwise low-rise fabric. Just 1% of these lots sit within the mapped federal flood zone. That modest flood share, together with the small but real historic-district overlap noted above, means neither overlay defines this designation's regulatory profile the way its mixed construction eras do.

The development ledger shows meaningful but not dramatic slack: 68% of lots record floor area below their allowance, with a median residual of 0.6 FAR — a real but modest gap, consistent with a stock that has already absorbed several rounds of new construction rather than sitting untouched since before the war. Taken as a whole, the file describes a designation rebuilt gradually across decades rather than in one push, with room still recorded on a majority of its lots. Every governing allowance behind that figure, along with its citation, is on the rules tables above; each individual lot's own page carries its specific recorded numbers.