Middlesex County and Somerville City property record for 21 Walnut St, Somerville, MA 02143
| Property Type | Triplex |
|---|---|
| Details | 7 bd · 3 ba · 4,322 sqft · built 1910 |
| Lot Size | 0.096 acres (4,200 sqft) |
| Owner | Individual Name on File |
| Tax Bill | $14,435 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 73-B-17 |
| Primary APN | 73-B-17 |
|---|---|
| Alternative APNs |
|
| Bedrooms | 7 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 18 Rooms |
| Units | 3 Units |
| Stories | 3 Stories |
| Building Area | 4,322 sqft Living Area |
| Gross Area | 7,224 sqft |
| Year Built | Built 1910 |
|---|---|
| Effective Year Built | Effective 1910 |
| Architectural Style | Other |
| Exterior Material | Aluminum/Vinyl |
| Roof Type | Gable |
| Roof Material | Slate |
| Lot Area | 4,200 sqft (0.096 acres) |
| Heating System | Hot Water |
|---|---|
| Heating Fuel | Gas |
| Account Number | 4186060 |
|---|---|
| Street Address | 21 WALNUT ST |
| City | SOMERVILLE |
| State | MA |
| Zip | 02143-3067 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Triplex |
| Local Zoning Code | NR |
| Legal Block | B |
| Legal Lot Number | 17 |
| Jurisdiction | SOMERVILLE MA |
| Township / Civil Division | SOMERVILLE |
| Census Block Group | 2 |
| Census Block | 2008 |
| Census Tract | 351300 |
21 Walnut St, a triplex, is owned and occupied by an individual.
Source: Middlesex County and Somerville City records, as of April 14, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 21 WALNUT ST, SOMERVILLE, MA 02143-3067 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Life Estate |
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 | Name on Deed |
|---|---|
| Record Updated | Jun 8, 2026 |
The 2025 property tax bill for 21 Walnut St was $14,435, up 6.1% from the year before.
Source: Middlesex County and Somerville City assessment roll, as of April 14, 2026
| Type | Name |
|---|---|
| State | Massachusetts |
| County | Middlesex County |
| Municipality | Somerville City |
| Unified School District | Somerville School District (PK - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2025 | $14,435.00 (+6.12%) | $1,323,100 (+2.33%) Land $623,900 Building $699,200 |
| 2024 | $13,602.00 (-1.23%) | $1,293,000 (-2.91%) Land $623,900 Building $669,100 |
| 2023 | $13,771.00 | $1,331,800 Land $623,900 Building $707,900 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 21 Walnut 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 21 Walnut 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 | SOMERVILLE WATER DEPT. (MWRA) serves 81,045 people · EPA ID MA3274000 |
|---|---|
| Water Source | Purchased surface water from MWRA |
| Last State Inspection | Oct 2025 |
| Lead | 4 ppb (2025) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | Lead service line replacement currently in violation since Nov 2019 |
| Monitoring and Reporting | 1 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 1,083 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 2,000 |
| Astound Broadband Cable · Fiber in parts of the area | 1,500 / 50 |
| Verizon Fixed Wireless | 1,000 / 75 |
| Netafy Fixed Wireless | 641 / 143 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless | 100 / 20 |
May also be available: Starry.
Search by:
By searching, you agree to: Terms • Privacy • Disclosures