Grand Concourse.

Three structural factors compound: (1) the housing stock — most large apartment buildings date to the 1920s-1940s with aging boilers, plumbing risers, and façades; (2) deep rent-regulated supply, where caps constrain owner repair budgets; (3) chronic landlord-portfolio neglect on a subset of the very-large buildings (12+ stories with hundreds of units each). The result is genuinely higher per-building counts than NYC averages.

ZIP 10452 (Highbridge / Mount Eden, west of the Concourse) carries the highest per-building open-violation counts in our index, followed by 10456 (Morrisania, east of the Concourse). 10453 (Mount Hope / University Heights edge) trends slightly lower thanks to more single-family and small-multifamily stock mixed in.

Several blocks of the Grand Concourse sit inside the Grand Concourse Historic District (designated 2011), which protects exterior façades and architectural features. Inside the HD, façade and window work requires LPC review — unpermitted modifications create LPC violations alongside DOB filings. Compliance issues inside the unit (heat, plumbing, lead) are unaffected by HD designation.

Yes — a large majority of pre-1974 Grand Concourse 6+ unit buildings are rent-stabilized through standard rules. The corridor holds one of NYC's deepest stabilized supplies. The audit's DHCR check shows the building's specific status; many tenants pay below-market stabilized rents without realizing the legal protections.

300+ open violations is not uncommon on the Grand Concourse for the largest pre-war buildings (300-500 units each). What matters is the class breakdown: class A violations (cosmetic, non-hazardous) can accumulate over years without affecting livability; class C (immediately hazardous — no heat in winter, lead paint with young children) are urgent. The audit shows the breakdown alongside the headline count.