486 Arsenal Way, Watertown — property record card
IMPUTED - Research and Development facilities built in 2001 on 6.18 acres in Watertown, assessed at $65,559,300 for fiscal year 2026; last transferred January 18, 2024 for a nominal sum.
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 | 486 Arsenal Way |
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| Map and parcel ID | 1214 1F 2 |
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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 | $29,917,300 |
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| Land | $14,762,400 |
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| Other | $20,879,600 |
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| Total assessed | $65,559,300 |
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Land
| Lot size | 6.18 acres (269,201 ft²) |
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Building
| Year built | 2001 |
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| Style | DATA CTR |
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| Living area | 201,300 ft² |
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| Stories | 2 |
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| Units | 2 |
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Last recorded sale
| Price | nominal ($10) |
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| Date | January 18, 2024 |
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| Deed | Registry of Deeds book 82408, page 593 |
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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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| 486 Arsenal Way | 1214 1F 2 | IMPUTED - Research and Development facilities | $64,849,500 | nominal ($10)
January 18, 2024 |
| Melendy Av | 1214 1F 2A | IMPUTED - Other (Charitable Org.) | $709,800 | $525,000
March 27, 2007 |
What MassDEP has recorded
- RTN 3-0020350 — Birch St Private, tier classified (active), status TIER1D · MassDEP file
- RTN 3-0020433 — Birch St Private, tier classified (active), status TIER1D · MassDEP file
- RTN 3-0020623 — Off Birch St Private, tier classified (active), status TIER1D · MassDEP file
- RTN 3-0020765 — Off Birch St Private, tier classified (active), status TIER1D · MassDEP file
- RTN 3-0020350 — Birch St Private, activity and use limitation, status TIER1D, AUL recorded January 25, 2001 · MassDEP file
- RTN 3-0020433 — Birch St Private, activity and use limitation, status TIER1D, AUL recorded March 2, 2001 · MassDEP file
- RTN 3-0020623 — Off Birch St Private, activity and use limitation, status TIER1D, AUL recorded April 24, 2001 · MassDEP file
- RTN 3-0020765 — Off Birch St Private, activity and use limitation, status TIER1D, AUL recorded August 2, 2001 · MassDEP file
- RTN 3-0020168 — Off Birch St Private, activity and use limitation, status RAO, class A3, AUL recorded November 30, 2001 · MassDEP file
- RTN 3-0019872 — Off Birch St, activity and use limitation, status RAO, class A3, AUL recorded November 30, 2001 · MassDEP file
Within about 500 m (a third of a mile): 9 active tier-classified 21E sites and 10 sites with an Activity and Use Limitation. All MassDEP sites in Watertown.
What this means
- The last deed was recorded for a nominal sum: a transfer between family members, into a trust or a similar non-market sale. It says nothing about the market value.
- An Activity and Use Limitation is a deed restriction: it limits how the land may be used (often no residential use or no digging) and passes to every buyer.
- 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 486 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)
Order the report