506 Amsterdam Avenue
506 Amsterdam Avenue in Upper West Side, Manhattan, has 6 open HPD violations, 3 of them class C, and 15 of 22 units are rent-stabilized, as of Oct 26, 2026. StreetSpy grade: C (71/100).
Mixed residential & commercial · 22 units · Built 1900
StreetSpy grade: C (Fair, 71/100)
- 3 immediately hazardous violations open (the class that covers no heat, pests, lead paint and similar).
- 1 eviction carried out by marshals in the last 3 years.
- The head officer on this registration is named on 152 buildings' registrations; 46 graded D or F.
- 15 of 22 units are rent-stabilized; 5 on the 2007 tax bill.
Fewer open violations per unit than 5 in 10 Manhattan buildings this size.
- Repairs: Medium (6 open, 3 class C), records as of Oct 26, 2026
- Heat and hot water: 2 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: Through Sep 1, 2027, records as of Oct 3, 2026
Housing code violations (HPD)
6 open violations: 3 class C (immediately hazardous), 3 class B, 0 class A. 1 issued in the last 12 months. 80 on record. Oldest open violation issued 2012-06-08. Newest violation issued 2025-11-06.
0 closed in the last 90 days. Median 4,573 days from issue to close for the 9 violations closed in the last 12 months.
- Class C: Fire escape defect, 5th room from the east, 4th floor. & 309 M/D LAW ABATE THE NUISANCE CONSISTING OF KEY OPERATED LOCK AT DOOR LEADING TO FIRE ESCAPE WINDOW IN THE 5th ROOM FROM EAST LOCATED AT APT 4A, 4th STORY, 2nd APARTMENT FROM SOUTH AT WEST (apt 4A), issued 2024-04-01. HPD violation 16782543
- Class C: Missing window guards, throughout the apartment, 1st floor. HMC INSTALL THE MISSING OR REPAIR/REPLACE THE DEFECTIVE WINDOW GUARD(S) IN ACCORDANCE WITH THE SPECIFICATIONS OF THE NEW YORK CITY HEALTH CODE SECTION 24 RCNY CHAPTER 12. WG TO INSTALL = 4; WG TO REPLACE = 0; WG TO REPAIR = 0; IN THE ENTIRE APARTMENT LOCATED AT APT 1A, 1st STORY, 2nd APARTMENT FROM SOUTH AT WEST (apt 1A), issued 2024-04-01. HPD violation 16782538
- Class C: Missing window guards, 1st room from the east, 5th floor. HMC INSTALL THE MISSING OR REPAIR/REPLACE THE DEFECTIVE WINDOW GUARD(S) IN ACCORDANCE WITH THE SPECIFICATIONS OF THE NEW YORK CITY HEALTH CODE SECTION 24 RCNY CHAPTER 12. WG TO INSTALL = 1; WG TO REPLACE = 0; WG TO REPAIR = 0; IN THE 1st ROOM FROM EAST AT SOUTH LOCATED AT APT 5C, 5th STORY, 2nd APARTMENT FROM NORTH AT EAST (apt 5C), issued 2012-06-11. HPD violation 9460846
- Class B: Missing or broken smoke / CO detector, throughout the apartment, 2nd floor. HMC: REPAIR OR REPLACE THE CARBON MONOXIDE DETECTING DEVICE(S). DEFECTIVE IN THE ENTIRE APARTMENT LOCATED AT APT 2B, 2nd STORY, 1st APARTMENT FROM SOUTH AT WEST (apt 2B), issued 2024-11-13. HPD violation 17415092
- Class B: Missing or broken smoke / CO detector, throughout the apartment, 2nd floor. REPAIR OR REPLACE THE SMOKE DETECTOR DEFECTIVE IN THE ENTIRE APARTMENT LOCATED AT APT 2B, 2nd STORY, 1st APARTMENT FROM SOUTH AT WEST (apt 2B), issued 2024-11-13. HPD violation 17415091
- Class B: Mice, throughout the apartment, 5th floor. ADMIN. CODE: ABATE THE NUISANCE CONSISTING OF MICE IN THE ENTIRE APARTMENT LOCATED AT APT 5C, 5th STORY, 2nd APARTMENT FROM NORTH AT EAST (apt 5C), issued 2012-06-08. HPD violation 9460847
311 housing complaints
3 in the last 12 months, 35 in 5 years. Most common: Heat/Hot Water (2), Plumbing (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: Owner reported 0 infested units
- 2021: No bedbug filing on record for this year
Buildings department (DOB)
No open DOB violations. 2 DOB violations on record. Check on DOB BIS.
Evictions and housing court
1 executed evictions in the last 3 years (1 on record). 0 open HPD cases; 0 harassment findings.
Rent stabilization
15 of 22 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).
Rent-stabilized units on city tax bills: 15 in 2024, 5 in 2007. Source: DOF tax bills for 2007 and 2024; years with no bill on file are left out.
Owner and management
Owner: NETTLESOME LLC. Head officer: MAGDALENA KOSZ. Managing agent: C/O AJ CLARKE RE CORP. This owner has 152 buildings on record, 46 graded D or F. See the full portfolio.
Last HPD registration Jul 20, 2026, valid through Sep 1, 2027.
Tax lot and city IDs
BBL 1012320033, HPD building ID 5963. HPD Online, ACRIS, DOB BIS.
Nearest subway
- 86 St (1), 3 min walk
- 79 St (1), 6 min walk
- 86 St (C, B), 8 min walk
How the grade is calculated
| Factor | On record | Points |
|---|---|---|
| Open HPD violations | 6 open (3 class C, 3 class B) | −18 |
| 311 housing complaints (12 mo) | 3 | −8 |
| Bedbug reports (3 yr) | None reported | 0 |
| Executed evictions (3 yr) | 1 | −3 |
| Housing litigation | No open cases | 0 |
| Open DOB violations | None | 0 |
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.