Annual Expiration Volume (Units at Risk)iBimodal distribution of 421-a expiration dates showing two peak waves of affordability loss. Red = within 5 years (immediate), amber = 6–10 years, green = 10+ years.
Bar color indicates urgency: red = within 5 years, amber = 6–10 years, green = 10+ years. Dashed line = annual average.
Cumulative Units Expiring Over TimeiRunning total of units losing 421-a protection from start of window to end. Shows cumulative affordability loss trajectory.
Borough Share of ExpirationsiDistribution of 421-a properties and units across NYC boroughs. Shows which boroughs face largest affordability loss risk.
Borough Expiration Trends (Units by Year)iYear-by-year expiration trajectory for each borough. Shows how expiration pressure varies across boroughs over time.
Program Start Era DistributioniTotal units by program enrollment period (2000–2025). Shows when properties joined the 421-a program.
Expiration Window SummaryiUnits and properties grouped by expiration timeframe with urgency classifications. Immediate = 2026, Crisis = by 2030.
Borough Deep DiveiComprehensive borough-level summary showing properties, units, peak expiration year, and near-term volumes (by 2030/2035).
Data source: Furman Center for Real Estate and Urban Policy, Subsidized Housing Database (BBL Analysis, May 2025). 421-a regular program only. Analysis date: March 24, 2026. Dashboard generated using Claude, an AI assistant by Anthropic, using datHere's qsv Cowork plugin. Content should be reviewed for accuracy.