Sunset Park.

Sunset Park's 1- to 4-family row house stock attracts conversion pressure from large immigrant households and rental investors. DOB enforcement records show it as one of Brooklyn's highest-volume illegal-conversion zones. The audit checks each BBL's filed CO against the listed unit count and flags mismatches. For any listing emphasizing a 'finished basement' or 'in-law unit,' run the audit before signing.

ZIP 11220 (central Sunset Park, around 5th Avenue and the southern blocks of 8th Avenue) carries the highest open-violation totals in our index, driven by dense walk-up and converted row-house stock. 11232 (industrial Sunset Park, west of 4th Avenue toward the waterfront) has fewer residential BBLs but a higher per-building rate on the ones that exist.

Most pre-1974 6+ unit Sunset Park buildings are rent-stabilized through standard rules. The neighborhood has retained meaningful stabilized supply because the conversion wave was slower than in northern Brooklyn. The audit's DHCR check shows current status; the 1- to 4-family row-house stock is generally not stabilized.

Pull the Certificate of Occupancy through the audit — it shows the building's filed unit count. A '2-family' or '3-family' listing with a CO for one fewer unit is an illegal conversion; the basement or attic unit can be vacated by DOB at any time. Many Sunset Park 1- and 2-family homes have unpermitted additions that don't appear on the CO.

Parts of western Sunset Park west of 3rd Avenue and into 11232 sit in FEMA Zones AE and X due to the bay-adjacent industrial waterfront. Most of the inland residential blocks east of 3rd Avenue are outside high-risk zones. The audit pulls FEMA designation per BBL for any property within several blocks of the waterfront.