Middlesex County and Watertown City property record for 321 Main St, Watertown, MA 02472
| Property Type | Mixed Use Commercial Office / Residential |
|---|---|
| Details | 6,259 sqft · built 1874 |
| Lot Size | 0.629 acres (27,392 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $1,125,000 (Nov 2002) |
| Tax Bill | $12,168 (2026) |
| Flood Zone | Zone X (minimal risk) |
| APN | 104600-10 |
| Primary APN | 104600-10 |
|---|---|
| Alternative APNs |
|
| Units | 12 Units |
|---|---|
| Building Area | 6,259 sqft Living Area |
| Gross Area | 6,695 sqft |
| Basement Area | 396 sqft |
| Unfinished Basement | 396 sqft |
| Year Built | Built 1874 |
|---|---|
| Effective Year Built | Effective 1874 |
| Lot Area | 27,392 sqft (0.629 acres) |
| Total Buildings | 2 Buildings |
| Cooling System | HVAC |
|---|---|
| Heating System | Forced Air with A/C |
| Account Number | 5201 |
|---|---|
| Street Address | 321 MAIN ST |
| City | WATERTOWN |
| State | MA |
| Zip | 02472-2388 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Mixed Use Commercial Office / Residential |
| Local Zoning Code | LB |
| Legal Block | 1 |
| Jurisdiction | WATERTOWN MA |
| Township / Civil Division | WATERTOWN TOWN |
| Census Block Group | 1 |
| Census Block | 1010 |
| Census Tract | 370103 |
321 Main St, a commercial property, is held in a trust since November 2002.
Source: Middlesex County and Watertown City records, as of October 20, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 331 MAIN ST, WATERTOWN, MA 02472-2359 |
| Owner Type | Individual |
| Vesting | Trust |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Nov 5, 2002 · Amount on File |
| Deed Sale | Nov 5, 2002 · Amount on File |
| Record Updated | Oct 29, 2026 |
The 2026 property tax bill for 321 Main St was $12,168.
Source: Middlesex County and Watertown City assessment roll, as of April 14, 2026
| Type | Name |
|---|---|
| State | Massachusetts |
| County | Middlesex County |
| Municipality | Watertown City |
| Unified School District | Watertown School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $12,168.00 | $997,400 (-6%) Land $504,000 Building $493,400 | $341,998 |
| 2025 | $2,493,500 (+6.64%) Land $1,260,000 Building $1,233,500 | ||
| 2024 | $2,338,200 Land $1,225,900 Building $1,112,300 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 321 Main St in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective September 10, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
The area around 321 Main St has no burnable land within ember reach, so its wildfire risk is not rated.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | WATERTOWN DEPARTMENT OF PUBLIC WORKS serves 35,985 people · EPA ID MA3314000 |
|---|---|
| Water Source | Purchased surface water from MWRA |
| Last State Inspection | Oct 2025 |
| Lead | 1 ppb (2025) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None last 3 years |
Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.
Source: FCC Broadband Data Collection, based on 610 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable · Fiber in parts of the area | 2,000 / 2,000 |
| Astound Broadband Cable · Fiber in parts of the area | 1,500 / 50 |
| Verizon Fiber · Fixed Wireless in parts of the area | 980 / 880 |
| AT&T Fixed Wireless | 100 / 20 |
May also be available: T-Mobile.
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