East Flatbush-Erasmus, Brooklyn

Erasmus's records point to a neighborhood built early and largely left alone since: 88% of recorded buildings predate 1940, and the median construction year sits at 1920, decades before the current zoning code existed in its present form. The postwar boom of 1945 to 1975 barely registers here, contributing just 2% of the buildings on file, while construction since 2000 accounts for 9% — a small but real share of newer activity layered onto a mostly prewar block pattern. Most of what stands on these roughly 3,700 lots was already built before either the boom or the current zoning resolution existed.

Two-family homes lead the building-class mix at 31%, followed by walk-up apartment buildings at 28% and one-family homes at 18%. Land use runs a similar mix: 48% of parcels are recorded as one- and two-family use, 27% as multi-family walk-up, and 14% as mixed residential and commercial. A recorded historic district covers 2% of lots here, a small footprint but a real one — a designation about protected status today, not about the neighborhood's broader age profile.

Zoning headroom sits at a middle range: 83% of lots carry some unused floor-area capacity, with a median residual FAR of 1. Residual FAR is simply the recorded difference between a lot's current floor area and what its district would allow if rebuilt — here, a middling figure. Height runs low, with a median of 2 stories, though 2% of buildings are recorded above 6 stories, a small but notable share of taller construction. Lots run a median of 2,000 square feet, reaching 5,000 square feet at the 90th percentile.

93% of parcels carry a residential designation, and the roll counts 22,658 housing units across them. No lots here are mapped inside a federal flood hazard area on record. Erasmus borders East Flatbush-Farragut, East Flatbush-Rugby, Flatbush, and Prospect Lefferts Gardens-Wingate. The districts governing the neighborhood are apartment-house categories of varying density, permitting the walk-up and two-family mix already visible in the building-class records.

Two-family and walk-up buildings, in the city's classification, mean two-unit houses and elevator-less multi-family structures — together, more than half of Erasmus's recorded building stock. That leaves one-family homes as the smallest of the three leading categories here. Read against the neighborhood's 88% prewar share, the class mix describes a place whose surviving building stock is overwhelmingly rowhouse and walk-up in character rather than standalone-house, on the evidence of these records.