21 William St
Cambridge, MA 02139
residentialSingle Family
Building & Site Intelligence
Complete building characteristics, construction details, and site data from municipal assessor records and supplementary sources.
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Property Intelligence: 21 William St, Cambridge, MA 02139
Property Overview
21 William St is a Conventional, Single Family, built in 1854, 3,292 square feet, 0.13 acres in MIDDLESEX County, MA. 2 bedrooms, 2 bathrooms. Ownership type: Individual. Assessed value: $2,424,300.
Condition & Permits
NEP Condition Estimate: C4. This property-specific condition rating is derived from municipal building permit records, not imagery or automated valuation models. 2 building permits on file from municipal records.
Risk & Hazard Profile
NEP Fire Protection Grade: B. FEMA flood zone: X. Hurricane storm surge exposure: Category 4. Risk assessment combines NEP proprietary ratings with federal, state, and municipal hazard data at parcel-level precision.
Ownership & Deed History
Last sale: December 1998 for $695,000. Full ownership chain, entity resolution, lien analysis, and comparable sales available with subscription.
About This Data
NE Provenance assembles property intelligence from municipal assessor records, building permit databases, county deed registries, federal environmental and hazard datasets, business registration filings, and state-level geospatial data — 140+ authoritative, primary sources corroborated at the individual address level.
Property data for Cambridge, MA and all six New England states. NE Provenance covers MIDDLESEX County and over 4.7 million properties across 29 counties with up to 430 intelligence attributes per property record.
