21 Mason St, Brookline, MA 02446
OFF MARKET

21 Mason St
Brookline, MA 02446

  • 8 Beds
  • 6.5 Baths
  • 6,421 sqft (on 0.25 acres)

$6,683,000

Trulia Estimate
as of Jun 8, 2026
Est. Refi. Payment $39,866/mo*
Refinance Your Home

$6,683,000

Trulia Estimate
as of Jun 8, 2026
Est. Refi. Payment $39,866/mo*
Refinance Your Home
8 Beds
6.5 Baths
6,421 sqft
(on 0.25 acres)

Local Information

Map showing home location
© Google
-- mins to
Commute Destination

Description

This single-family home is located at 21 Mason St, Brookline, MA. 21 Mason St is in Brookline, MA and in ZIP code 02446. This property has 8 bedrooms, 7 bathrooms and approximately 6,421 sqft of floor space. This property has a lot size of 10890 sqft and was built in 1910.
This property is off market, which means it's not currently listed for sale or rent on Trulia. This may be different from what's available on other websites or public sources.

Home Highlights

Parking
No Info
Outdoor
Deck
A/C
Heating & Cooling
HOA
None
Price/Sqft
No Info
Listed
Less than a day ago

Home Details for 21 Mason St

Interior Features

Interior Details
BasementNumber of Rooms: 16Types of Rooms: Family Room
Heating & Cooling
Heating: Forced Air, OilAir ConditioningHeating Fuel: Forced Air
Levels, Entrance, & Accessibility
Stories: 3Floors: Hardwood
Appliances & Utilities
DishwasherRefrigerator
Fireplace & Spa
Fireplace

Exterior Features

Exterior Home Features
Roof: SlateDeckExterior: Brick
Parking & Garage
Parking: On Street

Property Information

Year Built
Year Built: 1910Year Updated: 1968
Property Type / Style
Property Type: Single Family HomeArchitecture: Colonial

Community

Units in Building: 1

Lot Information

Lot Area: 10890 sqft

Price History for 21 Mason St

DatePriceEventSource
10/15/2018$4,000,000Sold
N/A
06/18/2018$3,700,000PendingAgent Provided
06/14/2018$3,700,000Listed For SaleAgent Provided
10/20/2016$1,500ListingRemovedAgent Provided
08/15/2015$1,600ListingRemovedAgent Provided
07/29/2015$1,600Listed For RentAgent Provided
02/07/2013$1,300ListingRemovedAgent Provided
02/05/2013$1,300Listed For RentAgent Provided

Market trends in Brookline

Last updated April 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
$1.42M
Sale-to-List Price
99.0%
Price per sq ft
$809
Available listings
227
28MoM
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Property Tax and Assessment

Year2025
Tax$67,586
Assessment$6,847,600
Home facts updated by county records

Comparable Sales for 21 Mason St

Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
53 Worthington Rd, Brookline, MA
0.09
Single-Family Home
$2,876,250
08/14/25
5
3.5
3,994
11 Abbottsford Rd, Brookline, MA
0.48
Single-Family Home
$2,621,500
12/29/25
8
4.5
4,720
6 Elba St, Brookline, MA
0.33
Single-Family Home
$3,000,000
12/09/25
5
4.5
2,997
105 Babcock St, Brookline, MA
0.46
Single-Family Home
$3,595,000
05/04/26
5
4.5
4,882
87 Crowninshield Rd, Brookline, MA
0.38
Single-Family Home
$3,865,000
07/28/25
4
2.5
3,838
232 Kent St, Brookline, MA
0.65
Single-Family Home
$4,000,000
08/01/25
5
4.5
5,296
36 Naples Rd, Brookline, MA
0.69
Single-Family Home
$4,200,000
06/05/26
6
6.5
6,000
57 Monmouth St, Brookline, MA
0.36
Single-Family Home
$3,750,000
05/27/26
5
3.5
3,500
66 Summit Ave, Brookline, MA
0.96
Single-Family Home
$3,860,000
11/20/25
6
5.5
5,789
61 Centre St, Brookline, MA
0.73
Single-Family Home
$3,475,000
06/26/25
5
3.5
4,699

Nearby homes

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Assigned Schools

These are the assigned schools for 21 Mason St.
View nearby schools on GreatSchools
The GreatSchools Rating compares schools on a variety of school quality indicators including test scores, college readiness, equity and more. Learn more.

What Locals Say about Brookline

At least 421 Trulia users voted on each feature.

  • 94 % Say there are sidewalks

  • 90 % Say it's dog friendly

  • 87 % Say it's walkable to restaurants

  • 87 % Say it's walkable to grocery stores

  • 84 % Say people would walk alone at night

  • 81 % Say streets are well-lit

  • 67 % Say kids play outside

  • 60 % Say there's holiday spirit

  • 59 % Say there's wildlife

  • 52 % Say parking is easy

  • 51 % Say they plan to stay for at least 5 years

  • 51 % Say it's quiet

  • 48 % Say neighbors are friendly

  • 40 % Say car is needed

  • 39 % Say yards are well-kept

  • 33 % Say there are community events

Sourced by Trulia users. Learn more about our methodology.
  • Rockygranahan
    "A quick and easy walk to the T. Total commute to downtown Boston from Coolidge Corner ranges between 15-25 minutes consistently."
    0
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  • Kai Hsin Chang
    "Very convenient to do grocery and most people live here use public transportation because there’s no street parking. People who want to do street parking should apply for parking permits."
    0
    Flag
  • Sydney Reitz
    "Events at the Coolidge corner theatre, Brookline day on Harvard street in Coolidge corner, open holiday meals at the United Parish church"
    0
    Flag
  • Sydney Reitz
    "The sidewalks and streets are well-maintained even in inclement weather. Traffic is only bad around the Longwood medical area and major streets around rush hour. Pub trans is easy and safe."
    0
    Flag
  • Austin Wozniak
    "Multiple dog friendly, off-leash parks in the community and many great places to walk a dog. The community is very dog friendly. "
    0
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  • Loming1986
    "Only limited (a hand-full) dog parks available, I wish there are more. Many neighbors have dogs and it’s a very dog friendly neighborhood."
    0
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  • Trulia User
    "Clean, safe and quiet. People are very friendly. Access ti public transportation. Love this place very much."
    0
    Flag
  • Trulia User
    "The neighborhood is great environment to raise a family. It’s peaceful, clean and quiet. We would love to be here to raise our kids here. "
    0
    Flag
  • Trulia User
    "I’v stayed in a hotel in this neighborhood. It is a beautiful area with many shops to explore. Hope to move to this area. "
    0
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  • Trulia User
    "Near everything. Train across the street, restaurants, coffee shops, etc JP is part of Boston. Vibrant community. Diverse. High incomes mixed with low. "
    1
    Flag
  • Trulia User
    "Yes, the area has many dog parks, both on and off leash. Most apartment buildings are dog friendly and neighbors have been very accepting. "
    0
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  • Aliana P.
    "It’s a quick commute to downtown, especially if you live on the D line. Very convenient. It’s also a very walkable area with all stores and necessities close by. "
    1
    Flag
  • Juana B.
    "It’s very safe and great school system!! I been leaving here for 11 years and I love it and my kids too"
    2
    Flag
  • Jiyoung W.
    "Lots of other friendly dog owners, plus lots of little parks and green space for pups to run around (especially Amory Park!). Lots of businesses in the area have dog treat jars too!"
    1
    Flag
  • Adriana P.
    "It seems let friendly. Lots of parks and spaces for dogs to run. I don’t have a dog but I have friends with dogs"
    0
    Flag
  • Archana B.
    "Lived here for 5 years. I highly recommend it. It is getting more expensive. Some areas are more family friendly than others. "
    0
    Flag
  • Deiabarroso86
    "Very safe, with a lot of stores around.. Beacon Street is a beautiful street and we have the Reservoir nearby, which is a good place for a walk."
    1
    Flag
  • Josie E.
    "The kids walk to school on a tree-lined street and neighbors know each other. A little oasis in the city "
    4
    Flag
  • Caroline
    "Drive to Watertown or take shuttle provided by my place of employment. Easy access to city via C or D green line. "
    0
    Flag
  • Dma333
    "Diverse, safe, close to everything, friendly neighbors, great schools, playgrounds in walking distance"
    0
    Flag
  • Steve L.
    "Hancock Village in Chestnut Hill is a good place to live overall. Sometimes the management office puts together special functions like handing out cider doughnuts in the fall, or flowers to plant - both gratis. (And more as well but too much to detail)."
    4
    Flag
  • Dma333
    "Block party in September Close to a great school Playgrounds nearby Diverse community Easy access to many communities "
    1
    Flag
  • Szonja.ruppert
    "Lots of greens, parks, even bags for dogpoop is put to parks. Not many pet shops in walking distance"
    0
    Flag
  • Scottcunha311
    "Halloween’s are very popular especially on clark rd. Great location to Cleveland circle and both bu and bc can take train anywhere or easily get a bus there’s no shortsge of things to do"
    0
    Flag
  • Jawaher A.
    "Good schools, no stealing, good neighbors, good place to kids to play, not far away from BU university, there is driving school, all government facilities around us, Uber so expensive but it is available all time, there is ice cream shop and Starbucks around us also a lot of restaurants and malls "
    2
    Flag
  • Courtney C.
    "Safe and homey - education is good but property tax is rising. Commute is perfect - only ten minute drive away from my work site. "
    0
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  • Luis B.
    "Lots of commerce within walking distance and easier access to the city by public transportation. Also very good public schools"
    0
    Flag
  • Magdalene M.
    "Right by the T and walking distance to Fenway! Blue bikes and scooters near by. Lots of ways to go. "
    0
    Flag
  • Jawaher A.
    "I love this area coz its safe and beautiful and the neighbors are nice and kind and there is a lot of great people "
    0
    Flag
  • Oliver L.
    "I walk to work in the medical area. T stops make getting to the center easy. It is quite possible to live without a car."
    0
    Flag
  • Sophie
    "The community center holds a lot of interesting activities like Mahjong, movies, reading, yoga and concerts. Also we have a greeeat library here!"
    0
    Flag
  • Kathy U.
    "Many dog parks around the Coolidge corner area. Many off leash areas too. The dog community it big in this neighborhood "
    0
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  • Heli C.
    "The schools are excellent, and neighbors tend to know each other. We are a ‘suburb’ of Boston but also officially a town with numerous distinct village neighborhoods, most of which are walkable to restaurants and amenities. Brookline has a fairly international mix of people, with families from all over the world coming here to study and work at the nearby Harvard teaching hospitals."
    0
    Flag
  • Ptetrault
    "It is a safe, welcoming and peaceful neighborhood. Heath is a great school. Close to T trains and buses."
    0
    Flag
  • Pat B.
    "It's dog friendly...there's lots of parks around to take pets."
    0
    Flag
  • Pat B.
    "There's some strange people who are around, but they're harmless. There's lots of daycare places, so if someone has a young kid there's lots of options nearby."
    1
    Flag
  • Billy W.
    "There is only one park on this hill, but a short walk can lead you to bigger parks and playgrounds."
    1
    Flag

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21 Mason St, Brookline, MA 02446 is a 8 bedroom, 7 bathroom, 6,421 sqft single-family home built in 1910. This property is not currently available for sale. 21 Mason St was last sold on Oct 15, 2018 for $4,000,000. The current Trulia Estimate for 21 Mason St is $6,683,000.