852 Union Street

852 Union Street in Park Slope, Brooklyn, has 7 open HPD violations, 1 of them class C, and 6 of 6 units are rent-stabilized, as of Oct 25, 2026. StreetSpy grade: D (60/100).

Multi-family walk-up · 6 units · Built 1902

StreetSpy grade: D (Poor, 60/100)

• 1 immediately hazardous violation open (the class that covers no heat, pests, lead paint and similar).
• 2 open violations are classified rent-impairing under NY Multiple Dwelling Law section 302-a.
• No housing complaints to 311 in the last 12 months.
• 6 of 6 units are rent-stabilized.

More open violations per unit than 6 in 10 Brooklyn buildings this size.

• Repairs: High (7 open, 1 class C), records as of Oct 25, 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 27, 2026
• Safety: Clear (No open DOB violations), records as of Oct 23, 2026
• Registration: Through Sep 1, 2027, records as of Oct 3, 2026

How the grade works

Housing code violations (HPD)

7 open violations: 1 class C (immediately hazardous), 5 class B, 1 class A. 1 issued in the last 12 months. 11 on record. Oldest open violation issued 2007-09-10. Newest violation issued 2026-05-06.

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

2 open violations are classified rent-impairing under NY Multiple Dwelling Law section 302-a. Section 302-a; NY Courts guidance on getting repairs.

• Class C: No hot water, bathroom. PROVIDE HOT WATER AT ALL HOT WATER FIXTURES KITCHEN AND BATHROOM 3 STY APT 3F , SECTION '' '' (apt 3F), issued 2007-09-10. HPD violation 2207080
• Class B: Lighting defect (exterior). D26-19.07 ADM CODE INSTALL AND MAINTAIN SUFFICIENT LIGHT OR LIGHTS OF AT LEAST 40 WATTS INCANDESCENT OR EQUIVALENT EACH, TO LIGHT ADEQUATELY FROM SUNSET TO SUNRISE THE REAR YARD NIGHT INSPECTION., issued 2008-08-20. HPD violation 2207078
• Class B: Damaged plaster or paint, kitchen. REPAIR THE BROKEN OR DEFECTIVE PLASTERED SURFACES AND PAINT IN A UNIFORM COLOR WALLS AND CEILING KITCHEN 2 STY APT 3F , SECTION '' '' (apt 3F), issued 2007-09-10. HPD violation 2207083
• Class B: Plumbing defect, bathroom. REPLACE WITH NEW THE BROKEN OR DEFECTIVE WATER CLOSET TANK COVER BATHROOM 2 STY APT 3F , SECTION '' '' (apt 3F), issued 2007-09-10. HPD violation 2207082
• Class B: Missing or broken smoke / CO detector. SECTION 27-2045, 2046 ADM CODE PROVIDE AN APPROVED AND OPERATIONAL SMOKE DETECTING DEVICE, INSTALLED IN ACCORDANCE WITH DEPARTMENT OF BUILDINGS RULES AND REGULATIONS DEFECTIVE 2 STY APT 3F , SECTION '' '' (apt 3F), issued 2007-09-10. HPD violation 2207085
• Class B: No hot water, bathroom. PROVIDE ADEQUATE SUPPLY OF HOT WATER FOR THE FIXTURES KITCHEN AND BATHROOM 2 STY APT 3F , SECTION '' '' (apt 3F), issued 2007-09-10. HPD violation 2207084
• Class A: Bedbugs. (A) § HMC:FILE ANNUAL BEDBUG REPORT IN ACCORDANCE WITH HPD RULE AS DESCRIBED ON THE BACK OF THIS NOTICE OF VIOLATION OR AS DESCRIBED ON HPDS WEBSITE, WWW.NYC.GOV\HPD, SEARCH BED BUGS., issued 2026-05-06. HPD violation 18892870

311 housing complaints

0 in the last 12 months, 1 in 5 years.

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

6 of 6 units rent-stabilized as of 2024. Stabilized renewals: 0% for one year and 0% for two years under RGB Order #58 (Oct 1, 2026 to Sep 30, 2027).

Owner and management

Owner: NICHOLAS G KOTSONIS. See the full portfolio.

Last HPD registration Jul 16, 2026, valid through Sep 1, 2027.

Tax lot and city IDs

BBL 3010650022, HPD building ID 383963. HPD Online, ACRIS, DOB BIS.

Nearest subway

• Grand Army Plaza (2, 3), 4 min walk
• 7 Av (B, Q), 5 min walk
• Bergen St (2, 3), 10 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.