Upper East Side-Carnegie Hill, Manhattan

Carnegie Hill's land-use file stands out from its denser Manhattan neighbors: 30% of lots are coded one- and two-family, the single largest recorded category, well ahead of the 25% coded mixed residential-and-commercial and 21% coded multi-family elevator. Building-class records confirm the low-rise character at street level — one-family classifications cover 24% of lots, with elevator-apartment buildings at 23% and walk-up buildings at 16%, a genuinely mixed file rather than one dominated by a single building type, distinct from the elevator-heavy files recorded in several nearby Upper East Side neighborhoods. That combination of one- and two-family land use with a meaningful elevator-building share describes a neighborhood that has kept a lower-rise fabric even as some of its immediate neighbors built taller.

Age records lean prewar: 89% of buildings predate 1940, the median construction year across the neighborhood's roughly 2,600 tax lots is 1909, and just 2% of the recorded stock has gone up since 2000 — one of the thinner recent-construction shares in this part of Manhattan. A further 6% of buildings fall inside the 1945-to-1975 postwar boom window. A historic district designation covers 60% of lots, one of the higher shares recorded among nearby Upper East Side neighborhoods, consistent with the low-rise, one- and two-family land-use pattern the rest of the file describes. Taken together, the age and historic-district figures describe a neighborhood whose physical fabric has changed comparatively little since the prewar era.

Height and capacity records show a median building of 5 stories, with 24% of the recorded stock rising above 6 stories. Development records find 72% of lots carrying unused floor-area capacity against current district limits, with a median residual of 1.2 FAR points neighborhood-wide. Lot sizes run to a median of 2,506 square feet, with the largest recorded lots reaching 10,845 square feet — a comparatively tight spread that suggests a fairly uniform parcel pattern rather than a mix of small and assembled lots. That combination of moderate height and real recorded headroom suggests capacity for incremental additions rather than large-scale redevelopment across most of the file.

None of Carnegie Hill's tax lots are recorded inside the federally mapped floodplain, a 0% share reflecting the current flood map rather than a claim about drainage or storm history at any address. Residential use covers 87% of the neighborhood's roughly 2,600 lots, and the file counts 44,503 housing units in total across that stock, a large residential population layered onto a building pattern that still leans toward one- and two-family homes. Between its one- and two-family land-use pattern, its historic-district coverage, and its overwhelmingly prewar construction-year profile, Carnegie Hill's tax-lot file describes one of the more architecturally consistent neighborhoods among those covered here.