The NYC Property Assessment Explorer is a public, searchable window into New York City's Department of Finance FY2027 property assessment roll — 1,167,962 tax lots worth $1.91 trillion in total market value, across all five boroughs and Tax Classes 1 through 4. Search any address, owner name, or BBL; filter by borough, tax class, property type, entity type, and value; and drill into 500 consolidated owner-entity profiles covering LLCs, corporate landlords, government agencies, and nonprofits (individual owners are never named publicly — privacy is a hard constraint). Value concentrates sharply: just 2,821 lots valued at $50M+ — 0.24% of the roll — carry $448.9 billion, or 23.5% of all NYC property value. The explorer also cross-references NYS HCR's 2024 rent-stabilization registry, matching 47,277 of 47,278 regulated buildings (99.998%) directly onto the assessment roll by BBL, plus full borough, housing-stock, and value-concentration breakdowns and a plain-English guide to how NYC's four property tax classes actually work.
1,167,962 tax lots make up the NYC Department of Finance's FY2027 property assessment roll, covering all five boroughs and Tax Classes 1 through 4. Together they carry a total market value of $1.91 trillion, a total assessed value of $536.1 billion, and a total taxable value of $465.3 billion after exemptions.
$1.91 trillion is the total market value across NYC's 1,167,962 assessed tax lots in the FY2027 DOF roll. Manhattan alone accounts for $654.9 billion of that across 179,175 lots — an average market value of $3.66 million per lot, by far the highest of the five boroughs.
2,821 tax lots — just 0.24% of the city's 1.17 million properties, each valued at $50 million or more — account for $448.9 billion, or 23.5% of NYC's entire $1.91 trillion property value. The explorer includes 500 consolidated owner-entity profiles built to reveal that concentration.
47,277 of 47,278 buildings (99.998%) in NYS HCR's 2024 rent-stabilization registry were successfully matched by BBL to the FY2027 DOF assessment roll, letting the explorer cross-reference any property's assessed value against whether its building is under rent regulation.
4 tax classes govern NYC property assessment. Tax Class 1 (661,673 one-to-three-family homes) is assessed at just 6% of market value; Tax Classes 2 and 4 (apartment buildings, commercial, most other property) are assessed at 45%. That gap is why similarly priced homes and condos can carry very different tax bills.