420 10th Street

420 10th Street in Park Slope, Brooklyn, has 23 open HPD violations, and no rent-stabilized units are on its tax bill, as of Oct 26, 2026. StreetSpy grade: D (55/100).

One & two family · 1 units · Built 1899

StreetSpy grade: D (Poor, 55/100)

• 23 open housing violations, none in the most serious class.
• No housing complaints to 311 in the last 12 months.
• No rent-stabilized units on the tax bill. Increases aren't capped by stabilization, though Good Cause Eviction may still limit them.

• Repairs: High (23 open), records as of Oct 26, 2026
• Heat and hot water: No complaints, 12 mo, records as of Oct 25, 2026
• Pests: Clear (No bedbug filing, 3 yr), records as of Oct 28, 2026
• Safety: High (3 open DOB violations), records as of Oct 26, 2026
• Registration: Expired Mar 31, 1998, records as of Oct 3, 2026

How the grade works

Housing code violations (HPD)

23 open violations: 0 class C (immediately hazardous), 5 class B, 6 class A, 12 class I (HPD orders such as lead paint or heat orders, not a hazard class). 1 issued in the last 12 months. 24 on record. Oldest open violation issued 2009-08-13. Newest violation issued 2026-04-30.

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

• Class B: Lighting defect (entrance). PROVIDE ADEQUATE LIGHTING AT OR NEAR THE OUTSIDE OF THE FRONT ENTRANCEWAY OF THE BUILDING AND KEEP SAME BURNING FROM SUNSET EVERY DAY TO SUNRISE ON THE DAY FOLLOWING A MINIMUM OF 100 WATTS OF INCANDESCENT LIGHT REQUIRED. (LIGHT FIXTURE PRESENT), issued 2015-10-28. HPD violation 10980269
• Class B: Door, lock or intercom defect (entrance). PROPERLY REPAIR THE BROKEN OR DEFECTIVE FRONT DOOR BELL ENTRANCE TO BLDG TO 1 STY FRONT APT 1F. , SECTION '' '' (apt 1F), issued 2009-08-13. HPD violation 983747
• Class B: Damaged plaster or paint. REPAIR THE BROKEN OR DEFECTIVE PLASTERED SURFACES AND PAINT IN A UNIFORM COLOR WALLS AND CEILING THROUGH OUT 1 STY FRONT APT 1F. , SECTION '' '' (apt 1F), issued 2009-08-13. HPD violation 983744
• Class B: & 309 M/D LAW ABATE THE NUISANCE CONSISTING OF STORAGE OF OLD MATRESS IN 2 ROOM FROM FRONT 1 STY APT 1F. , SECTION '' '' (apt 1F), issued 2009-08-13. HPD violation 983745
• Class B: Roaches. ABATE THE NUISANCE CONSISTING OF VERMIN MICE AND ROACHES 1 STY FRONT APT 1F. , SECTION '' '' (apt 1F), issued 2009-08-13. HPD violation 983746
• 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 2026-04-30. HPD violation 18846724
• 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 2025-06-05. HPD violation 17962007
• 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 2024-04-03. HPD violation 16816277

311 housing complaints

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

Bedbugs

No bedbug filing on record for the last 3 years. 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: No bedbug filing on record for this year
• 2024: No bedbug filing on record for this year
• 2023: No bedbug filing on record for this year
• 2022: No bedbug filing on record for this year
• 2021: No bedbug filing on record for this year

Buildings department (DOB)

3 open DOB violations, 2 of them Local Law violations issued before 2000. 3 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: LIAO FAMILY BROOKLYN PROPERTIES LLC. Head officer: GUO LZAO. Managing agent: GUO LZAO. See the full portfolio.

Last HPD registration Sep 29, 1997. HPD registration expired Mar 31, 1998 and had not been renewed as of Oct 3, 2026. Buildings with 3+ units must register with HPD every year.

Tax lot and city IDs

BBL 3010170029, HPD building ID 136163. HPD Online, ACRIS, DOB BIS.

Nearest subway

• 4 Av-9 St (R), 5 min walk
• 4 Av-9 St (F, G), 6 min walk
• 7 Av (F, G), 6 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.