Middlesex County and Waltham City property record for 520 Main St, Waltham, MA 02452
| Property Type | Mixed Use Commercial Office / Residential |
|---|---|
| Details | 20 bd · 22.5 ba · 18,795 sqft · built 1988 |
| Lot Size | 0.731 acres (31,842 sqft) |
| Owner | 2 Company Names on File |
| Last Sale | $3,300,000 (Feb 2015) |
| Deeds & Mortgages | Feb 2021 Refinance Sep 2019 Refinance + 1 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 71567 |
| Primary APN | 71567 |
|---|---|
| Alternative APN |
|
| Bedrooms | 20 Beds |
|---|---|
| Full Baths | 22.5 Baths |
| Half Baths | 5 Half Baths |
| Total Rooms | 32 Rooms |
| Units | 47 Units |
| Stories | 2 Stories |
| Building Area | 18,795 sqft Total Area |
| Gross Area | 25,204 sqft |
| Basement Area | 8,032 sqft |
| Unfinished Basement | 5,301 sqft |
| Year Built | Built 1988 |
|---|---|
| Effective Year Built | Effective 1988 |
| Exterior Material | Brick |
| Construction Type | Frame |
| Roof Type | Hip |
| Roof Material | Asphalt |
| Lot Area | 31,842 sqft (0.731 acres) |
| Cooling System | HVAC |
|---|---|
| Heating Fuel | Electric |
| Account Number | 71567 |
|---|---|
| Street Address | 520 MAIN ST |
| City | WALTHAM |
| State | MA |
| Zip | 02452-5549 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Mixed Use Commercial Office / Residential |
| Legal Subdivision | WALTHAM |
| Legal Block | 22 |
| Legal Lot Number | 1 |
| Jurisdiction | WALTHAM MA |
| Township / Civil Division | WALTHAM |
| Census Block Group | 5 |
| Census Block | 5002 |
| Census Tract | 368800 |
Source: Middlesex County and Waltham City records · APN 71567
Assessment roll updated April 14, 2026 · Last verified July 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 File |
|---|---|
| Mailing Address | 100 FELTON ST, 201, WALTHAM, MA 02453-4149 |
| Owner Type | Company |
| Vesting | Trust |
| Date | Document |
|---|---|
| Feb 22, 2021 | Deed of Trust, Mortgage · Stand-Alone Refinance HARBORONE BANK |
| Sep 17, 2019 | Deed of Trust, Mortgage · Stand-Alone Refinance HARBORONE BANK |
| May 14, 2020 | Deed of Trust, Mortgage · Stand-Alone Refinance HARBORONE BANK |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Feb 27, 2015 · Amount on Record |
| Deed Sale | Feb 27, 2015 · Amount on Record |
| Deed Book / Page | 64979 / 22 |
| Record Updated | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | WALTHAM MA |
| Property Address | 520 MAIN ST, WALTHAM, MA 02452-5549 |
| Transaction Type | Mortgage |
| Record Updated | Apr 02, 2026 |
| Name | Verified Name |
|---|
| Document Number | 077018-291 |
|---|---|
| Date | Feb 22, 2021 |
| Book Page | 77018/291 |
| Instrument | 38736 |
| Name | HARBORONE BANK |
|---|
| Type | Stand-Alone Refinance |
|---|---|
| Amount | Amount Recorded |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | WALTHAM MA |
| Property Address | 520 MAIN ST, WALTHAM, MA 02452-5549 |
| Transaction Type | Mortgage |
| Record Updated | Feb 05, 2021 |
| Name | Verified Name |
|---|
| Document Number | 73295-371 |
|---|---|
| Date | Sep 17, 2019 |
| Book Page | 73295/371 |
| Instrument | 141367 |
| Name | HARBORONE BANK |
|---|
| Type | Stand-Alone Refinance |
|---|---|
| Amount | Amount Recorded |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | WALTHAM MA |
| Property Address | 520 MAIN ST, WALTHAM, MA 02452-5549 |
| Transaction Type | Mortgage |
| Record Updated | Feb 05, 2021 |
| Name | Verified Name |
|---|
| Document Number | 74675-254 |
|---|---|
| Date | May 14, 2020 |
| Book Page | 74675/254 |
| Instrument | 73116 |
| Name | HARBORONE BANK |
|---|
| Type | Stand-Alone Refinance |
|---|---|
| Amount | Amount Recorded |
Source: Middlesex County and Waltham City records · Assessment roll updated April 14, 2026 · Last verified July 2026
| Type | Name |
|---|---|
| State | Massachusetts |
| County | Middlesex County |
| Municipality | Waltham City |
| Unified School District | Waltham School District (PK - 12) |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
| Year | Assessed Value | Assessed Market Value |
|---|---|---|
| 2025 | $5,455,200 (+15%) Land $2,870,000 Building $2,585,200 | $5,533,655 (+5.04%) |
| 2024 | $4,743,700 Land $2,604,000 Building $2,139,700 | $5,267,940 |
Source: FEMA National Flood Hazard Layer, Middlesex County (25017C), updated September 10, 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Wildfire Risk | Not rated no burnable land within ember reach |
|---|
Values are read at the parcel center point; lenders make the official flood determination.
Source: FCC Broadband Data Collection, availability as of December 31, 2025 · sampled at 435 locations within half a mile · Last verified October 2026
| Provider | Max Down / Up (Mbps) |
|---|---|
| Verizon Fiber · Fixed Wireless in parts of the area | 2,300 / 2,300 |
| Xfinity Cable | 2,000 / 2,000 |
| Radiate Holdings Cable | 1,500 / 50 |
| AT&T Fixed Wireless | 100 / 20 |
Source: EPA Safe Drinking Water Information System via ECHO, 2026 Q3 · EPA community water system boundaries v3.0, March 2026 · Last verified October 2026
| Water System | WALTHAM WATER DEPARTMENT serves 65,218 people |
|---|---|
| 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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.
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