Middlesex County and Waltham City property record for 20 Clematis Ave, Waltham, MA 02453
| Property Type | General Industrial |
|---|---|
| Details | 2 bd · 1.5 ba · 9,848 sqft · built 1950 |
| Lot Size | 0.236 acres (10,293 sqft) |
| Owner | Company Name on Record |
| Tax Bill | $27,350 (2026) |
| Deeds & Mortgages | Sep 2021 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 25467 |
| Primary APN | 25467 |
|---|---|
| Alternative APN |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 1.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 6 Rooms |
| Units | 2 Units |
| Stories | 2 Stories |
| Building Area | 9,848 sqft Total Area |
| Gross Area | 11,332 sqft |
| 1st Floor Area | 1,611 sqft |
| Basement Area | 4,786 sqft |
| Unfinished Basement | 1,196 sqft |
| Year Built | Built 1950 |
|---|---|
| Effective Year Built | Effective 1950 |
| Architectural Style | Ranch |
| Exterior Material | Concrete Block |
| Construction Type | Concrete |
| Roof Type | Flat |
| Roof Material | Tar & Gravel |
| Lot Area | 10,293 sqft (0.236 acres) |
| Garage Type | Attached |
| Cooling System | HVAC |
|---|---|
| Heating System | Forced Air with A/C |
| Heating Fuel | Gas |
| Account Number | 25467 |
|---|---|
| Street Address | 20 CLEMATIS AVE |
| City | WALTHAM |
| State | MA |
| Zip | 02453-7011 |
| Property Category | Industrial |
| Property Type | Industrial > General Industrial |
| Legal Block | 5 |
| Legal Lot Number | 7 |
| Jurisdiction | WALTHAM MA |
| Township / Civil Division | WALTHAM |
| Census Block Group | 4 |
| Census Block | 4000 |
| Census Tract | 369100 |
Source: Middlesex County and Waltham City records, as of October 20, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Company Name on Record |
|---|---|
| Mailing Address | 20 CLEMATIS AVE, WALTHAM, MA 02453-7011 |
| Owner Type | Company |
| Vesting | Company |
| Deed Names | Name on Deed |
|---|---|
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | WALTHAM MA |
| Property Address | 20 CLEMATIS AVE, WALTHAM, MA 02453-7011 |
| Transaction Type | Mortgage |
| Record Updated | Sep 17, 2021 |
| Name | Verified Name |
|---|
| Document Number | 78604-387 |
|---|---|
| Date | Sep 1, 2021 |
| Book Page | 78604/387 |
| Instrument | 195617 |
| Name | EASTERN BANK |
|---|---|
| Type | Bank |
| Type | Commercial Mortgage |
|---|---|
| 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 | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $27,350.00 (+14.08%) | $1,233,100 (+8.21%) Land $359,700 Building $873,400 |
| 2025 | $23,975.00 (+14.06%) | $1,139,500 (+12.28%) Land $339,300 Building $800,200 |
| 2024 | $21,019.00 (+3.88%) | $1,014,900 (+10.1%) Land $308,700 Building $706,200 |
| 2023 | $20,234.00 | $921,800 Land $280,600 Building $641,200 |
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 |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Claims | 1 (1992) |
| Claims Outside the SFHA | 1 of 1 |
| Most Recent Claim | Dec 1992 · Winter Coastal Storm |
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 348 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 |
May also be available: T-Mobile.
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