821 Union Street

821 Union Street in Park Slope, Brooklyn, has 3 open HPD violations, and no rent-stabilized units are on its tax bill, as of Oct 26, 2026. StreetSpy grade: C (74/100).

Multi-family walk-up · 8 units · Built 1920

StreetSpy grade: C (Fair, 74/100)

• 3 open housing violations, none in the most serious class.
• The head officer on this registration is named on 8 buildings' registrations; 4 graded D or F.
• The owner's bedbug filings report no infested units in the last 3 years.
• No rent-stabilized units on the tax bill. Increases aren't capped by stabilization, though Good Cause Eviction may still limit them.

More open violations per unit than 5 in 10 Brooklyn buildings this size.

• Repairs: Medium (3 open), records as of Oct 26, 2026
• Heat and hot water: No complaints, 12 mo, records as of Oct 25, 2026
• Pests: Clear (Owner reported none, 3 yr), records as of Oct 28, 2026
• Safety: Clear (No open DOB violations), records as of Oct 26, 2026
• Registration: Renewal not yet in city data, records as of Oct 3, 2026

How the grade works

Housing code violations (HPD)

3 open violations: 0 class C (immediately hazardous), 2 class B, 1 class A. 0 issued in the last 12 months. 9 on record. Oldest open violation issued 2008-06-03. Newest violation issued 2023-03-27. No new HPD violation has been issued here since 2023. Most of the open count is older violations that were never closed.

HPD recorded no violation closed here in the last 12 months.

• Class B: Missing or broken smoke / CO detector, 3rd floor. REPAIR OR REPLACE THE SMOKE DETECTOR DEFECTIVE LOCATED AT APT 3R, 3rd STORY, 2nd APARTMENT FROM SOUTH AT WEST (apt 3R), issued 2011-03-02. HPD violation 8834005
• Class B: Damaged plaster or paint, ceiling, bathroom, 3rd floor. REPAIR THE BROKEN OR DEFECTIVE PLASTERED SURFACES AND PAINT IN A UNIFORM COLOR AT CEILING IN THE BATHROOM LOCATED AT APT 3R, 3rd STORY, 2nd APARTMENT FROM SOUTH AT WEST (apt 3R), issued 2011-03-02. HPD violation 8834007
• Class A: Damaged plaster or paint, kitchen. D26-12.01 ADM CODE PAINT WITH LIGHT COLORED PAINT TO THE SATISFACTION OF THIS DEPARTMENT CLGS & WALLS FOYER KITCHEN FRONT & REAR ROOM 3 STY FRONT APT 1C. , SECTION '' '' (apt 1C), issued 2008-06-03. HPD violation 2206930

311 housing complaints

1 in the last 12 months, 1 in 5 years. Most common: Unsanitary Condition (1).

Bedbugs

The owner reported 0 infested units in the last 3 years of filings. HPD's bedbug filings are self-reported by the owner once a year; HPD does not inspect to confirm them.

• 2026: No bedbug filing on record for this year
• 2025: Owner reported 0 infested units
• 2024: Owner reported 0 infested units
• 2023: Owner reported 0 infested units
• 2022: No bedbug filing on record for this year
• 2021: Owner reported 0 infested units

Buildings department (DOB)

No open DOB violations. 0 DOB violations on record. Check on DOB BIS.

Evictions and housing court

0 executed evictions in the last 3 years (0 on record). 0 open HPD cases; 0 harassment findings.

Rent stabilization

No rent-stabilized units on the tax bill.

Owner and management

Owner: 821 NY LLC. Head officer: ISAAC WOLHENDLER. Managing agent: DOV WOLHENDLER. This owner has 8 buildings on record, 4 graded D or F. See the full portfolio.

Last HPD registration Oct 3, 2025. Registration on file through Sep 1, 2026; renewal not yet in the city's data.

Tax lot and city IDs

BBL 3009540062, HPD building ID 383935. HPD Online, ACRIS, DOB BIS.

Nearest subway

• 7 Av (B, Q), 5 min walk
• Grand Army Plaza (2, 3), 6 min walk
• Union St (R), 7 min walk

How the grade is calculated

Sources: NYC HPD Housing Maintenance Code Violations, NYC 311 Service Requests, NYC HPD Bedbug Reporting, NYC Marshal Evictions (DOI), NYC HPD Housing Litigations, NYC DOB Violations, NYC DOF tax bills (via JustFix Who Owns What portfolio API, v2), NYC HPD Property Registration. Methodology. Report generated 2026-10-28.