Mount Eden-Claremont (West), The Bronx

The most striking number in the Mount Eden-Claremont (West) file concerns what has not been built: 90% of its roughly 1,100 tax lots carry recorded floor area below what their zoning districts allow — nine lots in every ten with room left on paper — and the median residual floor-area ratio is 2.3, a wide margin rather than a sliver. A residual of that size is not a promise of construction; it is the measured gap between what the rules permit and what the assessment roll records as standing, summarized here as a median across lots that each tell their own story.

Headroom on this scale usually means the buildings predate the rules, and here the records say exactly that. The stock is deeply prewar — 79% of buildings predate 1940, and the median build year is 1924, decades before the current zoning map was drawn. The boom years between 1945 and 1975 contribute just 3%, and 13% has arrived since 2000. What stands is apartment fabric: walk-up apartment buildings lead the class ledger at 34%, with two-family homes at 21% and elevator apartment buildings at 14%.

Land use reads the same way — multi-family walk-ups on 29% of lots, one- and two-family buildings on 24%, and multi-family elevator buildings on 11% — with 74% of lots residential and 19,724 housing units recorded, one of the heavier unit counts in this part of the borough. The buildings hold to a median of 3 stories, with 4% rising past 6 floors, on lots of a median 3,600 square feet; one lot in ten runs to 15,275 or more.

The constraint columns are quiet. Federal flood mapping places 0% of lots in the mapped floodplain — a statement about the current maps, not a promise about water — and no lot falls within a designated historic district, so neither designation appears as a recorded limit on the headroom described above. Neighboring files include Claremont Village-Claremont (East), Concourse-Concourse Village, Highbridge, Mount Hope, and University Heights (South)-Morris Heights. Lot-level allowance, year built, and flood status for each of the roughly 1,100 parcels can be pulled individually on PearlAudit.