423 Amsterdam Avenue

423 Amsterdam Avenue in Upper West Side, Manhattan, has 3 open HPD violations, and no rent-stabilized units are on its tax bill, as of Oct 26, 2026. StreetSpy grade: B (80/100).

Mixed residential & commercial · 15 units · Built 1888

StreetSpy grade: B (Good, 80/100)

• 3 open housing violations, none in the most serious class.
• 1 open violation is classified rent-impairing under NY Multiple Dwelling Law section 302-a.
• 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.

Fewer open violations per unit than 5 in 10 Manhattan buildings this size.

• Repairs: Low (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: High (10 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. 7 on record. Oldest open violation issued 2008-07-02. Newest violation issued 2024-04-01. No new HPD violation has been issued here since 2024. Most of the open count is older violations that were never closed.

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

1 open violation is classified rent-impairing under NY Multiple Dwelling Law section 302-a. Section 302-a; NY Courts guidance on getting repairs.

• Class B: Items blocking a hallway or exit (hallway). SECTION 27-2005, 2007 ADM CODE REMOVE ALL ENCUMBRANCES CONSISTING OF HOUSE HOLD ITEMS AT PUBLIC HALL, 6th STORY, issued 2008-08-21. HPD violation 7432843
• Class B: No heat / heating defect (basement). D26-10.01, 10.05 ADM CODE ARRANGE AND MAKE SELF-CLOSING THE DOORS CELLAR TO BOILER ROOM., issued 2008-07-02. HPD violation 2390041
• Class A: Damaged plaster or paint (entrance). D26-22.03 ADM CODE POST SIGN ON WALL OF ENTRANCE STORY BEARING NAME, ADDRESS INCLUDING APARTMENT NUMBER IF ANY, AND TELEPHONE NUMBER OF SUPERINTENDENT, JANITOR OR HOUSEKEEPER., issued 2008-07-02. HPD violation 2390044

311 housing complaints

0 in the last 12 months, 0 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: No bedbug filing on record for this year
• 2022: Owner reported 0 infested units
• 2021: Owner reported 0 infested units

Buildings department (DOB)

10 open DOB violations, all 10 Local Law violations issued before 2000. 10 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: 423. AMCO C/O LAWRENCE ARNSTEN. Head officer: LAWRENCE E ARNSTEN. Managing agent: PAUL ARNSTEN. See the full portfolio.

Last HPD registration Sep 6, 2025. Registration on file through Sep 1, 2026; renewal not yet in the city's data.

Tax lot and city IDs

BBL 1012110002, HPD building ID 5921. HPD Online, ACRIS, DOB BIS.

Nearest subway

• 79 St (1), 3 min walk
• 81 St-Museum of Natural History (C, B), 6 min walk
• 86 St (1), 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.