521 HANCOCK STREET
521 HANCOCK STREET is a Class C0 (walk-up, 3+ families) building in Brooklyn (BBL 3016550079) built in 1899, with 3 residential units across 3 floors.
The building is in NYC community district 303, council district 36, zoning district R6B, on a 1,908-square-foot lot with a building footprint of 3,280 square feet.
The current registered owner of record per NYC PLUTO is 521 HANCOCK LLC.
The most recent ACRIS deed transfer for this BBL was recorded on October 8, 2025 when ALVANZA, KIMBERLY K; ALVANZA, CARRIE C conveyed the property to 521 HANCOCK LLC for a non-disclosed consideration. The transaction was financed with a $1.00M mortgage from Hudson Group Realty Network, Inc..
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
Most recent deed
Recent ACRIS documents (last 3)
Building stats
- Zoning:
- R6B
- Lot size:
- 1,908 sqft
- Building area:
- 3,280 sqft
- Floors:
- 3
- Assessed value:
- $111K
- Community district:
- 303
- Council district:
- 36
HPD violations
Recent HPD violation details
- Class BInspected Jan 26, 2022§ 27-2005 ADM CODE REPAIR THE BROKEN OR DEFECTIVE PLASTERED SURFACES AND PAINT IN A UNIFORM COLOR THE CEILING IN THE 3rd ROOM FROM NORTH LOC…
- Class CInspected Jan 26, 2022§ 27-2005, 2007, 204.1 HMC CODE: ARRANGE AND MAKE SELF-CLOSING THE DOORS .. IN THE ENTRANCE LOCATED AT APT GROUND, 1st STORY, 1st APARTMENT…
Recent ACRIS activity
Frequently asked questions about 521 HANCOCK STREET
Who owns 521 HANCOCK STREET?
The current registered owner of record for 521 HANCOCK STREET per NYC PLUTO is 521 HANCOCK LLC. The most recent ACRIS deed transfer for this BBL was recorded on October 8, 2025 when the property was conveyed to 521 HANCOCK 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 521 HANCOCK STREET last sold?
The most recent ACRIS deed transfer for 521 HANCOCK STREET was recorded on October 8, 2025, when ALVANZA, KIMBERLY K; ALVANZA, CARRIE C conveyed the property to 521 HANCOCK LLC for a non-disclosed consideration. The transaction was financed with a $1.00M mortgage from Hudson Group Realty Network, Inc..
How many HPD violations does 521 HANCOCK STREET have?
No open HPD housing-maintenance code violations are on record for 521 HANCOCK STREET. The building is not registered with NYC HPD's landlord-registration system, which is typical for owner-occupied 1-2 family dwellings. HPD violation data is pulled daily from the NYC Open Data violations feed.
What is the assessed value of 521 HANCOCK STREET?
NYC Department of Finance assesses 521 HANCOCK STREET at $111K 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 521 HANCOCK STREET and what does that mean?
521 HANCOCK STREET is NYC building class C0 — Walk-up, 3+ families. A 3-to-6-story walk-up apartment building (no elevator), 3 or more residential units. 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.