500 Arsenal St 510, Watertown — property record card
IMPUTED - Research and Development facilities built in 1981 on 5.66 acres in Watertown, assessed at $56,811,000 for fiscal year 2026; last sold for $10,350,000 on August 11, 2000.
Rebuilt from the Watertown assessor file as published by MassGIS — not the official card. For the official card, with owner, photo and sketch, ask the Watertown assessor’s office.
Parcel
| Location | 500 Arsenal St 510 |
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| Map and parcel ID | 1234 1A 0 |
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| Use | IMPUTED - Research and Development facilities (use code 404C) |
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| County | Middlesex |
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Valuation — fiscal year 2026
| Building | $42,337,200 |
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| Land | $12,870,100 |
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| Other | $1,603,700 |
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| Total assessed | $56,811,000 |
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Land
| Lot size | 5.66 acres (246,550 ft²) |
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Building
| Year built | 1981 |
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| Style | Research/Devel |
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| Living area | 93,662 ft² |
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| Stories | 2 |
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Last recorded sale
| Price | $10,350,000 |
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| Date | August 11, 2000 |
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| Deed | Registry of Deeds book 31703, page 530 |
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What MassDEP has recorded
- RTN 3-0037593 — No Location Aid, tier classified (active), status TIERII · MassDEP file
Within about 500 m (a third of a mile): 8 active tier-classified 21E sites and 12 sites with an Activity and Use Limitation. All MassDEP sites in Watertown.
What this means
- A tier-classified site is a release still being cleaned up under the Massachusetts Contingency Plan; the MassDEP file shows the stage reached.
Point at the centre of the assessor parcel — not a survey.
Data: Watertown assessor file for fiscal year 2026, via MassGIS, retrieved October 30, 2026; MassDEP sites retrieved the same day. Sources and freshness. No owner names are published.
The report for 500 Arsenal St 510
This page shows the assessor record and the MassDEP sites on the parcel. The report adds what lies around it: FEMA flood zone, wetlands, Zone II and other water supply protection areas, priority habitat, sewer or septic service, protected open space, and every 21E site within half a mile.
$19card · PDF within 24 h · you pay after receiving itSee the sample (PDF)
Order the report