Norfolk County and Brookline Town property record for 21 Carlton St, Brookline, MA 02446
| Property Type | Condominium |
|---|---|
| Details | 2 bd · 2.5 ba · 1,634 sqft · built 1961 |
| Lot Size | 0.345 acres (15,065 sqft) |
| Owner | Individual Name on File |
| Last Sale | $250,000 (Feb 1986) |
| Tax Bill | $14,711 (2026) |
| Flood Zone | Zone X (minimal risk) |
| APN | 4320031 |
| Primary APN | 4320031 |
|---|---|
| Alternative APN |
|
| Bedrooms | 2 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 6 Rooms |
| Stories | 2 Stories |
| Building Area | 1,634 sqft Living Area |
| Gross Area | 1,834 sqft |
| Basement Area | 200 sqft |
| Finished Basement | 200 sqft |
| Unfinished Basement | 200 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1961 |
|---|---|
| Effective Year Built | Effective 1961 |
| Architectural Style | Condo/Apartment |
| Exterior Material | Brick |
| Construction Type | Concrete |
| Roof Type | Gable |
| Roof Material | Asphalt |
| Lot Area | 15,065 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | HVAC |
|---|---|
| Heating System | Forced Air with A/C |
| Account Number | 4320031 |
|---|---|
| Street Address | 21 CARLTON ST |
| City | BROOKLINE |
| State | MA |
| Zip | 02446-5601 |
| Property Category | Residential |
| Property Type | Residential > Condominium / Townhouse > Condominium |
| Legal Block | 114 |
| Legal Lot Number | 3 |
| Jurisdiction | BROOKLINE MA |
| Township / Civil Division | BROOKLINE |
| Census Block Group | 2 |
| Census Block | 2005 |
| Census Tract | 400100 |
Source: NPS National Register of Historic Places, as of August 1, 2026
| Historic District | Within the Longwood Historic District listed 1978 · 61 contributing resources · NRIS 78000460 |
|---|
Federal listing alone does not restrict alterations; local historic district rules, which this data does not cover, may apply.
21 Carlton St, a condominium, is owned by an individual who bought it in February 1986.
Source: Norfolk County and Brookline Town records, as of October 20, 2026
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | PO BOX 55806, BOSTON, MA 02205-5806 |
| Owner Type | Individual |
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 |
|---|---|
| Last Sale | Feb 3, 1986 · Amount on File |
| Deed Sale | Feb 3, 1986 · Amount on File |
| Deed Book / Page | 6940 / 480 |
| Record Updated | Oct 29, 2026 |
The 2026 property tax bill for 21 Carlton St was $14,711, up 10.4% from the year before.
Source: Norfolk County and Brookline Town assessment roll, as of April 14, 2026
| Type | Name |
|---|---|
| State | Massachusetts |
| County | Norfolk County |
| County Subdivision | Brookline Town |
| Unified School District | Brookline School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $14,711.00 (+10.38%) | $1,436,600 (+6.38%) Building $1,436,600 | $1,313,320 |
| 2025 | $13,328.00 (+3.04%) | $1,350,400 (+2%) Building $1,350,400 | |
| 2024 | $12,935.00 (-1.03%) | $1,323,900 (+1%) Building $1,323,900 | |
| 2023 | $13,069.00 | $1,310,800 Building $1,310,800 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 21 Carlton St in Zone X, an area of minimal flood risk, within 100 ft of a high-risk flood zone.
Source: FEMA National Flood Hazard Layer, effective May 26, 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 100 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on File median of 11 policies |
| Nearby Flood Policies | 11 in force |
| Nearby Flood Claims | 4 (1982–1998) |
| Claims Outside the SFHA | 3 of 4 |
| Most Recent Claim | Jun 1998 · Heavy Rains And Flooding |
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.
The area around 21 Carlton 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 | BROOKLINE WATER AND SEWER DIVISION serves 63,191 people · EPA ID MA3046000 |
|---|---|
| Water Source | Purchased surface water from MWRA |
| Last State Inspection | Apr 2026 |
| Lead | 1 ppb (2025) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None 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 299 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Xfinity Cable | 2,000 / 2,000 |
| Astound Broadband Cable | 1,500 / 50 |
| Verizon Fixed Wireless · Fiber in parts of the area | 1,000 / 75 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless | 100 / 20 |
May also be available: Starry.
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