Middlesex County and Waltham City property record for 173 Prospect St, Waltham, MA 02453
| Property Type | Duplex |
|---|---|
| Details | 9 bd · 5 ba · 3,446 sqft · built 1896 |
| Lot Size | 0.121 acres (5,271 sqft) |
| Owner | 2 Trust Names on File |
| Last Sale | $730,000 (May 2018) |
| Tax Bill | $11,666 (2026) |
| Deeds & Mortgages | Apr 2021 Mortgage May 2018 Sale & Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 94604 |
| Primary APN | 94604 |
|---|---|
| Alternative APN |
|
| Bedrooms | 9 Beds |
|---|---|
| Full Baths | 5 Baths |
| Half Baths | 2 Half Baths |
| Total Rooms | 14 Rooms |
| Units | 2 Units |
| Stories | 2 Stories |
| Building Area | 3,446 sqft Living Area |
| Gross Area | 5,183 sqft |
| Basement Area | 1,709 sqft |
| Unfinished Basement | 1,709 sqft |
| Year Built | Built 1896 |
|---|---|
| Effective Year Built | Effective 1896 |
| Architectural Style | Duplex Single |
| Exterior Material | Aluminum/Vinyl |
| Construction Type | Frame |
| Roof Type | Flat |
| Roof Material | Other |
| Lot Area | 5,271 sqft (0.121 acres) |
| Garage Type | Detached |
| Cooling System | HVAC |
|---|---|
| Heating System | Forced Air with A/C |
| Heating Fuel | Gas |
| Account Number | 94604 |
|---|---|
| Street Address | 173 PROSPECT ST |
| City | WALTHAM |
| State | MA |
| Zip | 02453-3432 |
| Property Category | Residential |
| Property Type | Residential > Multi-Unit > Duplex |
| Legal Block | 9 |
| Legal Lot Number | 8 |
| Jurisdiction | WALTHAM MA |
| Township / Civil Division | WALTHAM |
| Census Block Group | 1 |
| Census Block | 1015 |
| Census Tract | 368400 |
173 Prospect St, a duplex, is held in a trust since May 2018.
Source: Middlesex County and Waltham City records, as of October 20, 2026
| Owner of Record | 2 Trust Names on File |
|---|---|
| Mailing Address | 152 PROSPECT ST, WALTHAM, MA 02453-3411 |
| Owner Type | Company |
| 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.
| Date | Document |
|---|---|
| Apr 22, 2021 | Deed of Trust, Mortgage · Commercial Mortgage WATERTOWN SAVINGS BANK |
| May 25, 2018 | Quit Claim Deed, Transfer WATERTOWN SAVINGS BANK |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | May 25, 2018 · Amount on File |
| Deed Sale | May 25, 2018 · Amount on File |
| Prior Sale | Jul 10, 2006 · Amount on File |
| Deed Book / Page | 71058 / 53 |
| Transfer Doc | 0071058-53 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | WALTHAM MA |
| Property Address | 173 PROSPECT ST, WALTHAM, MA 02453-3432 |
| Transaction Type | Mortgage |
| Record Updated | Apr 2, 2026 |
| Name | Verified Name |
|---|
| Document Number | 0077582-62 |
|---|---|
| Date | Apr 22, 2021 |
| Book Page | 77582/62 |
| Instrument | 91110 |
| Name | WATERTOWN SAVINGS BANK |
|---|---|
| Type | Bank |
| Type | Commercial Mortgage |
|---|---|
| Amount | Amount on Record |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | WALTHAM MA |
| Recording Date | May 25, 2018 |
| Property Address | 173 PROSPECT ST, WALTHAM, MA 02453-3432 |
| Document Number | 71058-53 |
| Book / Page | 71058 / 53 |
| Instrument | 73667 |
| Transaction Type | Transfer |
| Record Updated | May 12, 2021 |
| Amount | Amount on Record |
|---|---|
| Downpayment | Downpayment on Record |
| Loan-to-Value (LTV) | LTV on Record |
| Tax | $0.00 |
| Amount Accuracy | Full Amount Stated |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 179 PROSPECT ST, WALTHAM, MA 02453-3432 |
| Document Number | 710580056 |
|---|---|
| Date | May 25, 2018 |
| Instrument | 71058/0056 |
| Name | WATERTOWN SAVINGS BANK |
|---|---|
| Type | Bank |
| Amount | Amount on Record |
|---|
The 2026 property tax bill for 173 Prospect St was $11,666, up 1.2% from the year before.
Source: Middlesex County and Waltham City assessment roll, as of April 14, 2026
| Type | Name |
|---|---|
| State | Massachusetts |
| County | Middlesex County |
| Municipality | Waltham City |
| Unified School District | Waltham School District (PK - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $11,666.00 (+1.15%) | $1,130,400 (-3.75%) Land $373,900 Building $756,500 |
| 2025 | $11,533.00 (+8.47%) | $1,174,400 (+6.48%) Land $340,700 Building $833,700 |
| 2024 | $10,632.00 (+10.27%) | $1,102,900 (+18.05%) Land $338,600 Building $764,300 |
| 2023 | $9,642.00 | $934,300 Land $324,500 Building $609,800 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 173 Prospect St in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.
Source: FEMA National Flood Hazard Layer, effective September 10, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 3 in force |
| Nearby Flood Claims | 5 (1988–2021) |
| Most Recent Claim | Aug 2021 · rainfall accumulation |
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Wildfire risk around 173 Prospect St is low, with less than a 0.01% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 99.1% of the US · lower than 98.7% of Massachusetts |
|---|---|
| Wildfire Likelihood | Under 0.01% annual chance |
| Exposure | Direct burnable vegetation |
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 | WALTHAM WATER DEPARTMENT serves 65,218 people · EPA ID MA3308000 |
|---|---|
| Water Source | Purchased surface water from MWRA |
| Last State Inspection | Jun 2024 |
| Lead | 2 ppb (2025) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| 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 280 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Verizon Fiber · Fixed Wireless in parts of the area | 2,300 / 2,300 |
| Xfinity Cable | 2,000 / 2,000 |
| Astound Broadband Cable | 1,500 / 50 |
| AT&T Fixed Wireless | 100 / 20 |
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