Middlesex County and Waltham City property record for 133 Prospect St, #143, Waltham, MA 02453
| Property Type | Mixed Use Commercial Office / Residential |
|---|---|
| Details | 4 bd · 5.5 ba · 7,008 sqft · built 1940 |
| Lot Size | 0.35 acres (15,250 sqft) |
| Owner | 2 Company Names on Record |
| Last Sale | $300,000 (Jan 1994) |
| Deeds & Mortgages | Jan 2024 Refinance |
| Flood Zone | Zone X (minimal risk) |
| APN | 94178 |
| Primary APN | 94178 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 5.5 Baths |
| Half Baths | 7 Half Baths |
| Total Rooms | 6 Rooms |
| Stories | 2 Stories |
| Building Area | 7,008 sqft Total Area |
| Gross Area | 10,221 sqft |
| Basement Area | 2,199 sqft |
| Unfinished Basement | 2,199 sqft |
| Year Built | Built 1940 |
|---|---|
| Effective Year Built | Effective 1940 |
| Exterior Material | Brick |
| Construction Type | Steel Frame |
| Roof Type | Flat |
| Roof Material | Tar & Gravel |
| Lot Area | 15,250 sqft (0.35 acres) |
| Garage Type | Attached |
| Heating System | Forced Air with A/C |
|---|---|
| Heating Fuel | Oil |
| Account Number | 94178 |
|---|---|
| Street Address | 133 PROSPECT ST, 143 |
| City | WALTHAM |
| State | MA |
| Zip | 02453-3442 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Mixed Use Commercial Office / Residential |
| Legal Block | 10 |
| Legal Lot Number | 5 |
| Jurisdiction | WALTHAM MA |
| Township / Civil Division | WALTHAM |
| Census Block Group | 1 |
| Census Block | 1013 |
| Census Tract | 368400 |
Source: Middlesex County and Waltham City records, as of April 14, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Company Names on Record |
|---|---|
| Mailing Address | 143 PROSPECT ST, R, WALTHAM, MA 02453-3442 |
| Owner Type | Company |
| Vesting | Trust |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Jan 25, 1994 · Amount on Record |
| Deed Sale | Jan 25, 1994 · Amount on Record |
| Record Updated | Jun 8, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | WALTHAM MA |
| Property Address | 133 PROSPECT ST # 143, 143, WALTHAM, MA 02453-3442 |
| Transaction Type | Mortgage |
| Record Updated | Feb 9, 2024 |
| Name | Verified Name |
|---|
| Document Number | 082430-136 |
|---|---|
| Date | Jan 26, 2024 |
| Book Page | 82430/136 |
| Instrument | 8644 |
| Name | JOHN SAVA |
|---|
| Type | Stand-Alone Refinance |
|---|---|
| Amount | Amount Recorded |
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 | Assessed Value |
|---|---|
| 2025 | $1,287,300 (+14.4%) Land $454,700 Building $832,600 |
| 2024 | $1,125,300 (+12.23%) Land $413,700 Building $711,600 |
| 2023 | $1,002,700 Land $376,100 Building $626,600 |
Assessed value is set for property tax purposes and is not a market price estimate.
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 |
|---|---|
| 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.
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 | 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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