Pending

$1,299,000

21 Hosmer St, Mattapan, MA 02126

9beds

4,056sqft

$8,174/mo

Get pre-qualified

3 Family

Built in 1900

-- sqft lot

$1,225,100 Zestimate^®

$320/sqft

$-- HOA

What's special

Central airNewer rubber roofNew sidingDecks throughoutHardwood floorsModern kitchens and bathsUpdated electrical

A rare, fully turn-key Mattapan multi-family delivering scale, flexibility, and immediate income in a high-demand Boston market. This oversized 3-family features three expansive 3 bed/1 bath units, each with layouts that can easily function as 4-bedroom apartments maximizing rental potential. Designed for today’s buyer, the property offers central air, updated electrical, hardwood floors, modern kitchens & baths, new siding, newer rubber roof, & decks throughout. The building is well-maintained with a strong in-place rent roll, creating a true plug-and-play investment or an ideal opportunity for an owner-occupant to offset their mortgage with substantial income. ***NOTE***Additional upside: the identical neighboring property at 19 Hosmer St is also available...purchase one or secure both for a scalable $240K+ gross annual rent play. Positioned near public transit, retail, and many amenities, this is a high-performing Boston multi-family with long-term appreciation and income growth!

117 days
47
5

Facts & features

Interior

Bedrooms & bathrooms

Bedrooms: 9
Bathrooms: 3
Full bathrooms: 3

Features

Flooring: Hardwood
Basement: Full
Has fireplace: No

Interior area

Total structure area: 4,056
Total interior livable area: 4,056 sqft
Finished area above ground: 4,056

Property

Parking

Total spaces: 6
Parking features: Off Street
Uncovered spaces: 6

Features

Patio & porch: Porch

Lot

Size: 4,225 Square Feet
Features: Other

Details

Parcel number: W:14 P:04135 S:020,1358746
Zoning: R3

Construction

Type & style

Home type: MultiFamily
Property subtype: 3 Family

Materials

See Remarks
Foundation: Other
Roof: Shingle

Condition

Year built: 1900

Utilities & green energy

Electric: 200+ Amp Service
Sewer: Public Sewer
Water: Public
Utilities for property: for Gas Range

Community & HOA

Community

Features: Public Transportation, Shopping, Pool, Tennis Court(s), Park, Walk/Jog Trails, Golf, Medical Facility, Laundromat, Bike Path, Highway Access, House of Worship, Private School, Public School, T-Station, University

Location

Region: Mattapan

Financial & listing details

Price per square foot: $320/sqft
Tax assessed value: $1,031,900
Annual tax amount: $11,949
Date on market: 5/14/2026
Total actual rent: 9900

Estimated market value

$1,225,100

$1.16M - $1.29M

$3,723/mo

Price history

Date	Event	Price
8/26/2026	Pending sale	$1,299,000$320/sqft
Source: MLS PIN #73519103 Report a problem
6/4/2026	Price change	$1,299,000-3.8%$320/sqft
Source: MLS PIN #73519103 Report a problem
5/14/2026	Listed for sale	$1,350,000+350%$333/sqft
Source: MLS PIN #73519103 Report a problem
5/12/2014	Sold	$300,000-10.4%$74/sqft
Source: Public Record Report a problem
8/24/2007	Sold	$335,000$83/sqft
Source: Public Record Report a problem

Public tax history

Year	Property taxes	Tax assessment
2025	$11,949 +12.1%	$1,031,900 +5.5%
2024	$10,661 +8.6%	$978,100 +7%
2023	$9,817 +8.6%	$914,100 +10%
2022	$9,041 +2%	$831,000
2021	$8,867 +21.3%	$831,000 +20%
2020	$7,311 +10.2%	$692,300 +10%
2019	$6,632 +12.7%	$629,200 +12%
2018	$5,887 +444.4%	$561,700 +2%
2017	$1,081 -75%	$550,700 +40.1%
2016	$4,325 +12.6%	$393,200 +24%
2015	$3,841 +7.8%	$317,200 +12%
2014	$3,563 +0.5%	$283,200 +5%
2013	$3,544 -1.5%	$269,700 -2.2%
2012	$3,598 +2%	$275,900
2011	$3,529 +6.6%	$275,900 -1%
2010	$3,310 -5.8%	$278,600 -15.7%
2009	$3,514 -27.3%	$330,600 -25%
2008	$4,834 -4.2%	$440,700 -4%
2007	$5,044	$459,000