490 Arsenal Way, Watertown — property record card
IMPUTED - Research and Development facilities built in 2015 on 11.72 acres in Watertown, assessed at $131,269,800 for fiscal year 2026; last sold for $157,567,600 on August 29, 2018.
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 | 490 Arsenal Way |
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| Map and parcel ID | 1214 1F 3 |
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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 | $109,070,900 |
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| Land | $0 |
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| Other | $22,198,900 |
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| Total assessed | $131,269,800 |
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Land
| Lot size | 11.72 acres (510,314 ft²) |
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Building
| Year built | 2015 |
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| Style | Research/Devel |
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| Living area | 199,311 ft² |
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| Stories | 2 |
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| Units | 2 |
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Last recorded sale
| Price | $157,567,600 |
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| Date | August 29, 2018 |
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| Deed | Registry of Deeds book 71544, page 323 |
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2 assessor accounts on this parcel
Condominium units or several buildings share one parcel; each has its own assessment.
| Address | Account | Use | Assessed | Last sale |
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| 490 Arsenal Way | 1214 1F 3 | IMPUTED - Research and Development facilities | $131,163,200 | $157,567,600
August 29, 2018 |
| 490 Arsenal Way #P2 | 1214 1F 3P2 | IMPUTED - Research and Development facilities | $106,600 | $157,567,600
August 29, 2018 |
What MassDEP has recorded
- RTN 3-0038069 — Linx Ii, tier classified (active), status TIERII · MassDEP file
Within about 500 m (a third of a mile): 9 active tier-classified 21E sites and 9 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 490 Arsenal Way
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)
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