509 4 AVENUE is a mid-century 1931 building, 1 unit in Park Slope, NYC. Owned by PETRAS GEN. CONTRACTING AND DEVELOPING C ORP. Public records show 42 open violations on file.
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Brooklyn · February 2026
Best & worst months to sign a lease
Potential savings: ~7% by timing your move to November.
Asking rent per bedroom type — switch tabs to see each with effective (concession-net) rent.
Monthly counts over the last 7 years · all data sources
No HPD records on file in the last 7 years.
Portfolio-level grade reflects the landlord's buildings across NYC, weighted by unit count. Individual building grades may differ.
View full landlord profileACRIS deeds and regulatory filings
South Park Slope and the Gowanus borderlands offer the brownstone beauty of Park Slope with slightly more edge — the Gowanus Canal is being cleaned up, Old Stone House park hosts community events, and Fifth Avenue's bar and restaurant scene is unpretentious and local.