21 Mason St
Brookline, MA 02446
- 5Beds
- 7Baths
- 6,421ft²Living Area
- 10,886ft²Lot Size
- -Pool
- -Car
- 1910Year Built
- -DOM
- 19Permits
Property Valuations
Latest estimates for 21 Mason St based on TopHap automated valuation model (AVM).
TopHap Estimate
$7,405,088
$1,153/ft²
Updated 4 months ago
21 Mason St is valued at $7,405,088 by TopHap AVM 4 months ago.
Permits
21 Mason St has 19 permit records.
Current Ownership
Information about the current owner(s).
Taxes Billed
Taxes billed in 2025$67,586.00From latest Total Assessed Value0.99%Total Assessed Value$6,847,600=Land+
Assessed Value$2,286,300Additions
Assessed Value$4,561,300
In 2025, taxes billed for 21 Mason St were $67,586, which is 0.99% from latest Total Assessed Value of $6,847,600.
Property History
21 Mason St has undefined property events records (listings, deeds, permits, tax, foreclosure, loan).
Environment
Environmental factors around 21 Mason St
Hazard Risks
Hurricane128Wind128Lead111Air Pollution108Ozone105Carb Mono102Nat'l Avg100Particulates98Weather97Hail78Earthquake76Tornado60
12 hazards (Carbon Monoxide, Earthquake Risk, Hail Index, Tornado Index, Hurricane Index, Air Pollution Index, Ozone Index, Wind Index, Weather Risk, Lead Index, Particulate Matter, National Average) are above the national average around 21 Mason St.
Walkability Index
17 /20
Most Walkable
20-18
Very Walkable
17-15
Somewhat Walkable
14-10
Car Dependent
9-0
21 Mason St has a walkability score of 17 out of 20, which means that it is in a very walkable area.
Temperature
Seasonal temperature sampled over multiple years
Winter
Average
Low
21°F
High
38°F
Summer
Average
Low
60°F
High
80°F
In the winter at 21 Mason St, temperatures range from 21.24°F to 37.77°F with an average of 29.51°F. In the summer, the temperature ranges from 59.96°F to 79.81°F with and average of 69.89°F.
School Information
Public/private schools serving 21 Mason St
Public Schools
Nearby public schools serving 21 Mason St have ratings undefined, undefined, and undefined.
Neighborhood
This property is located in Coolidge Corner, Brookline, MA 02446.
Seasonal Housing units 02446
32%of housing is for seasonal rent.
Daytime Population for 02446
-10%of people during work hours.
Crime Index for 02446
149
The crime index in 02446 is 149, which is 1.5 times higher than national average.
Market Trends
Historical market data near 21 Mason St over selected time period.
Nearby Properties on Mason St
- 1 Mason St, Brookline, MA 02446 (Coolidge Corner) is a 8,001 square foot, 8 bedroom, 7.5 bathroom, 0.25 acre property. It was built in 1911 and has an estimate of $6,815,600 with a price per ft² of $852.
- 11 Mason St, Brookline, MA 02446 (Coolidge Corner) is a 5,827 square foot, 6 bedroom, 5.25 bathroom, 0.25 acre property. It was built in 1900 and has an estimate of $5,343,110 with a price per ft² of $917.
- 21 Mason St, Brookline, MA 02446 (Coolidge Corner) is a 6,421 square foot, 5 bedroom, 7.5 bathroom, 0.25 acre property. It was built in 1910 and has an estimate of $6,614,046 with a price per ft² of $1,030.
- 8 Mason St, Brookline, MA 02446 (Coolidge Corner) is a 1.1 acre property.