🏢 Building Snapshot
- Address
- 523 EAST 21 STREET, Brooklyn, NY, USA
- Borough
- Brooklyn
- Neighborhood
- Flatbush
- BBL
- 3-05185-0073
- Property Type
- Cooperative (Co-op) (D1)
- Building Class
- D1
- Year Built
- 1910
- Floors
- 6
- Buildings on Lot
- 1
- Residential Units
- 42
- Total Units
- 42
- Gross Sq Ft
- 51,611
- Lot Area (sq ft)
- 14,464
- Zoning
- R7A
- Owner of Record
- 525 East 21 Corp
- Property Management
- —
💰 Financial Snapshot
- Fiscal Year
- 2026/27 Final
- Market Value
- $2,161,000
- Taxable Assessed Value
- $966,150
- Taxable Billable Assessed Value
- $966,150
- Assessed Value Exemptions
- —
- Tax Class
- —
- Assessed Value (used)
- $966,150
📋 Compliance Snapshot
Local Law 97 — Carbon Emissions
51,611 sq ft — verify compliance at nyc.gov
LL84 / LL133 — Energy Benchmarking
51,611 sq ft — annual filing required
LL87 — Energy Audit & Retro Commissioning
10-year cycle — block ending in 5
LL33 — Energy Efficiency Grade
Some buildings are exempt — check grade at nyc.gov/buildings
LL11 / FISP — Façade Inspection
6-story building — Sub-cycle 2 — Verify at nyc.gov/buildings
💸 Pied-a-Terre Surcharge Estimate
Illustrative estimate based on average unit assessed value.
- Avg Unit Assessed Value
- $23,004
- Annual Surcharge
- $0
- Effective Rate
- 0.00%
Below $1M threshold
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Request the full report →Data drawn from NYC PLUTO, DOF PROPMAST, HPD registrations and other public records. See full disclaimer.