East Harlem (South), Manhattan

East Harlem (South) carries a flood profile that stands out against Manhattan's usual bedrock reputation: the city's tax-lot records place 37% of its roughly 990 parcels inside the federally mapped flood zone. That's a statement about where the regulatory boundary falls, not a claim about water reaching any specific block — the map line can run between two adjacent lots, putting one inside and its neighbor just outside. For a neighborhood of this size, a share above a third touches a meaningful stretch of the built environment along its eastern edge, with real consequences for insurance requirements and construction rules on the lots it covers.

The building stock itself tells a prewar story. The median recorded construction year is 1910, and 78% of buildings on record predate 1940 — this stretch of Manhattan was substantially built out before the current zoning code existed. Only 9% of the recorded stock dates to the 1945-1975 postwar boom, and just 10% has gone up since 2000, so new construction is the exception rather than the rule. The neighborhood's present form was largely fixed generations ago, and what has changed since has been comparatively modest infill rather than wholesale rebuilding.

Walk-up apartment buildings make up 44% of the recorded building-class mix, with elevator buildings at 12% and a further recorded building class at 7%. Land use leans toward mixed residential-and-commercial parcels at 33%, followed by multi-family walk-ups at 29% — a pattern that tracks with a corridor built around ground-floor storefronts topped by apartments. Height is modest and consistent across the neighborhood: a median of 5 stories, with only 14% of buildings recorded above 6 floors, and 73% of all lots classified as residential.

On the development side, 69% of lots carry recorded floor area below what current rules would allow, with a median residual of 1.4 FAR points on the lots that qualify — meaning the records show more allowed floor area than what's actually built, on the typical parcel. Only 1% of lots sit inside a designated historic district, so that recorded headroom isn't constrained by landmark review for most of the neighborhood. Median lot size runs small at 2,523 square feet, though a handful of larger holdings push the upper end of the range up to 20,184 square feet, and the neighborhood carries 29,701 recorded residential units in total.

PearlAudit's per-lot records break each of these figures down to the address level, useful for comparing a specific parcel against the neighborhood median rather than relying on the aggregate alone. East Harlem (South) borders East Harlem (North), Harlem (South), and the Upper East Side's Carnegie Hill and Yorkville sections.