634 CLASSON AVENUE
634 CLASSON AVENUE is a Class S9 (misc mixed-use) building in Brooklyn (BBL 3011410043) built in 1931, with 8 residential units across 4 floors.
The building is in NYC community district 308, council district 35, zoning district R6A, on a 2,450-square-foot lot with a building footprint of 6,250 square feet.
The current registered owner of record per NYC PLUTO is HP MJM HOUSING DEVELOPMENT FUND COMPANY, INC.,.
The most recent ACRIS deed transfer for this BBL was recorded on June 24, 2021 when 634 CLASSON LLC; 663 CLASSON LLC; 667 CLASSON LLC; 643 FRANKLIN LLC; 483 ST MARKS LLC; 489 ST MARKS LLC; 515 ST MARKS LLC; 649-651 CLASSON LLC; 1020 PACIFIC LLC; 1063 PACIFIC LLC; 592 FRANKLIN LLC; 808 BERGEN LLC; 818 BERGEN LLC; 872 BERGEN LLC conveyed the property to HP MJM HOUSING DEVELOPMENT FUND COMPANY, INC.,; PROSPECT AFFORDABLE PACKAGE LLC for $22.07M. The transaction was financed with a $17.70M mortgage from Rockrose Llc.
The building is registered with NYC HPD's landlord-registration system and has no open HPD housing-maintenance code violations on record as of May 18, 2026.
Data sourced daily from NYC PLUTO (Department of City Planning), NYC ACRIS (Department of Finance), and NYC HPD housing-maintenance code violations.
Owner of record
HPD registered contacts
- Head OfficerMATTHEW KELLER
- Corporate OwnerPROSPECT AFFORDABLE PACKAGE LLC
- Managing AgentNIEUW AMSTERDAM PROPERTY MANAGEMENT
- Site ManagerGABE STONE
Most recent deed
Activity timeline
Recent ACRIS documents (last 5)
Building stats
- Zoning:
- R6A
- Lot size:
- 2,450 sqft
- Building area:
- 6,250 sqft
- Floors:
- 4
- Assessed value:
- $1.1M
- Community district:
- 308
- Council district:
- 35
HPD violations
Recent HPD violation details
- Class AInspected Oct 30, 2025§ 53, 187, 231 M/D LAW AND DEPARTMENT RULES AND REGULATIONS. PROVIDE A SHOE PROPERLY SECURED TO BOTTOM OF STRING OF DROPLADDER SHOE AT NORTH…
- Class AInspected Apr 15, 2022§ 27-2011 ADM CODE CLEANSE TO THE SATISFACTION OF THIS DEPARTMENT THE CERAMIC TILES SURFACE WITH GROUTED JOINTS OF VISIBLE MOLD AT SOUTH WAL…
- Class AInspected Apr 15, 2022§ 27-2005 ADM CODE PROPERLY REPAIR THE BROKEN OR DEFECTIVE INOPERATIVE INTERCOM SYSTEM FROM BUILDING FRONT ENTRANCE TO PANEL AT NORTH WALL I…
- Class BInspected Apr 15, 2022§ 27-2005 ADM CODE PROPERLY REPAIR THE BROKEN OR DEFECTIVE INOPERATIVE LIGHT FIXTURE AT CEILING AT PUBLIC HALL, 2nd STORY
- Class BInspected Apr 15, 2022§ 27-2046.1 HMC: REPAIR OR REPLACE THE CARBON MONOXIDE DETECTING DEVICE(S). MISSING IN THE ENTIRE APARTMENT LOCATED AT APT 2B, 2nd STORY, 1s…
Recent ACRIS activity
Frequently asked questions about 634 CLASSON AVENUE
Who owns 634 CLASSON AVENUE?
The current registered owner of record for 634 CLASSON AVENUE per NYC PLUTO is HP MJM HOUSING DEVELOPMENT FUND COMPANY, INC.,. The most recent ACRIS deed transfer for this BBL was recorded on June 24, 2021 when the property was conveyed to HP MJM HOUSING DEVELOPMENT FUND COMPANY, INC.,; PROSPECT AFFORDABLE PACKAGE LLC. PLUTO ownership is refreshed monthly by NYC Department of Finance; the registered owner may not reflect transactions recorded within the last 30 days.
When was 634 CLASSON AVENUE last sold?
The most recent ACRIS deed transfer for 634 CLASSON AVENUE was recorded on June 24, 2021, when 634 CLASSON LLC; 663 CLASSON LLC; 667 CLASSON LLC; 643 FRANKLIN LLC; 483 ST MARKS LLC; 489 ST MARKS LLC; 515 ST MARKS LLC; 649-651 CLASSON LLC; 1020 PACIFIC LLC; 1063 PACIFIC LLC; 592 FRANKLIN LLC; 808 BERGEN LLC; 818 BERGEN LLC; 872 BERGEN LLC conveyed the property to HP MJM HOUSING DEVELOPMENT FUND COMPANY, INC.,; PROSPECT AFFORDABLE PACKAGE LLC for $22.07M. The transaction was financed with a $17.70M mortgage from Rockrose Llc.
How many HPD violations does 634 CLASSON AVENUE have?
No open HPD housing-maintenance code violations are on record for 634 CLASSON AVENUE as of May 18, 2026. The building is registered with NYC HPD's landlord-registration system. HPD violation data is pulled daily from the NYC Open Data violations feed.
What is the assessed value of 634 CLASSON AVENUE?
NYC Department of Finance assesses 634 CLASSON AVENUE at $1.15M for the current tax year. NYC assesses property at a fraction of estimated market value (the assessment ratio varies by tax class — 6% for tax class 1 one-to-three-family dwellings, approximately 45% for tax class 2 rental apartment buildings), so the market value implied by this assessment is meaningfully higher. Assessment data is published by NYC Department of Finance.
What building class is 634 CLASSON AVENUE and what does that mean?
634 CLASSON AVENUE is NYC building class S9 — Misc mixed-use. Miscellaneous mixed residential and commercial building. Building class is assigned by NYC Department of Finance and recorded in PLUTO; it determines the property's tax class and the regulatory regime that applies.