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!
Property Details
Price:
$1,299,000
MLS #:
73519103
Status:
Active
Beds:
9
Baths:
3
Type:
Multi Family
Subtype:
3 Family
Neighborhood:
mattapan
Listed Date:
May 14, 2026
Finished Sq Ft:
4,056
Total Sq Ft:
4,056
Lot Size:
4,225 sqft / 0.10 acres (approx)
Year Built:
1900
Units:
3
See this Listing
Schools
Interior
Above Grade Finished Area
4056
Bathrooms
3 Full Bathrooms
Flooring
Hardwood
Levels
3
Exterior
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
Construction Materials
See Remarks
Lot Features
Other
Open Parking Spaces
6
Parking Features
Off Street
Parking Spots
6
Parking Total
6
Patio And Porch Features
Porch
Roof
Shingle
Stories
3
Financial
Tax Year
2025
Taxes
$11,949
Map
Community
- Address21 Hosmer St Boston MA
- CityBoston
- CountySuffolk
- Zip Code02126
Subdivisions in Boston
- Adams Village
- Ashmont Hill
- Ashmont Hill / Carruth Area
- Back Bay
- Bay Village
- Beacon Hill
- Bellevue Hill
- Boston
- Brighton-Oak Square
- Charlestown
- Chestnut Hill
- Chestnut Hill /Brookline line
- Chestnut Hill Park Condominium
- Clam Point Neighborhood
- Eight Streets Neighborhood
- Ellis South End Neighborhood
- Fairmount Hill
- Fields Corner
- Gas Light District
- Golf Course Neighborhood
- Harbor View
- Harborview
- Highland
- Hyde Park
- Jamaica Plain
- Lower Mills
- Melville Park
- Metropolitan Heights Area
- Metropolitan Hill
- Mission Hill – Longwood Medical
- Oak Square
- Parkway neighborhood
- Roslindale
- Roslindale – WC Bates
- roslindale village
- Roxbury’s Moreland Street Historic District
- Savin Hill: Minutes to Carson Beach/UMass Boston T-Stop
- South Boston
- Suffolk County
- Sumner Hill
- Thomas Park
- Woodbourne
Market Summary
Current real estate data for Multi Family in Boston as of Jun 10, 2026
429
Multi Family Listed
120
Avg DOM
483
Avg $ / SqFt
$2,105,598
Avg List Price
Property Summary
- 21 Hosmer St Boston MA is a Multi Family for sale in Boston, MA, 02126. It is listed for $1,299,000 To schedule a showing of MLS#73519103 at 21 Hosmer St in Boston, MA, contact your Cornerstone Real Estate agent at 617-238-7400.
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Courtesy of Stony Brook & Lennox Realty Advisors. The property listing data and information set forth herein were provided to MLS Property Information Network, Inc. from third party sources, including sellers, lessors and public records, and were compiled by MLS Property Information Network, Inc. The property listing data and information are for the personal, non-commercial use of consumers having a good faith interest in purchasing or leasing listed properties of the type displayed to them and may not be used for any purpose other than to identify prospective properties which such consumers may have a good faith interest in purchasing or leasing. MLS Property Information Network, Inc. and its subscribers disclaim any and all representations and warranties as to the accuracy of the property listing data and information set forth herein.
21 Hosmer St
Boston, MA