445 Borthwick Ave
Portsmouth, NH 03801
Institutional
Building & Site Intelligence
Complete building characteristics, construction details, and site data from municipal assessor records and supplementary sources.
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Property Intelligence: 445 Borthwick Ave, Portsmouth, NH 03801
Property Overview
445 Borthwick Ave is a Institutional, 17.5 acres in Rockingham County, NH. Ownership type: Government. Assessed value: $898,800.
Condition & Permits
3 building permits on file from municipal records. Electrical system last permitted 3 years ago.
Risk & Hazard Profile
NEP Fire Protection Grade: D. FEMA flood zone: X. Risk assessment combines NEP proprietary ratings with federal, state, and municipal hazard data at parcel-level precision.
Ownership & Deed History
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 Portsmouth, NH and all six New England states. NE Provenance covers Rockingham County and over 4.7 million properties across 29 counties with up to 430 intelligence attributes per property record.
