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INVESTMENT SNAPSHOT
About this property
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
| Units | 3 |
| Living area | 4,056 sqft |
| Lot size | 4,225 sqft |
| Year built | 1900 |
| Price / sqft | $320 |
| County | Suffolk |
| MLS # | 73519103 |
Listing status
| Days on market | 25 days |
| Listed on | May 14, 2026 |
Taxes & financials
| Annual property tax | $11,949 |
| Tax year | 2025 |
| Assessed value | $1,031,900 |
| Zoning | R3 |
| Gross income (actual) | $118,800/yr |
| Net operating income (actual) | $118,800/yr |
| Total actual rent | $9,900/mo |
Building & lot
| Stories | 3 |
| Total rooms | 18 |
| Lot size | 0.1 acres |
| Garage spaces | 0 |
| Parking spaces | 6 |
| Parking | Off Street |
| Basement | Full |
| Foundation | Other |
| Roof | Shingle |
| Construction | See Remarks |
| Flooring | Hardwood |
Utilities & systems
| Sewer | Public Sewer |
| Water | Public |
| Utilities | for Gas Range |
Location
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Listing courtesy of Stony Brook & Lennox Realty Advisors — Markese Daise. Listing data © MLS PIN.
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Questions & answers
Auto-generated from the listing data — richer AI answers coming with the live site.
How many units does 21 Hosmer St, Boston MA 02126 have?
It is a 3-unit multi-family property with 4,056 sqft of living area, built in 1900.
How long has 21 Hosmer St, Boston MA 02126 been on the market?
21 Hosmer St, Boston MA 02126 has been listed for 25 days (since May 14, 2026).
What is the estimated cap rate on this 3-family in Boston?
Based on area median rents, the estimated cap rate is about 5.9%, with a Signal Score of 93/100. These are directional estimates, not an appraisal.
What is the price per unit?
At a list price of $1,299,000 across 3 units, that works out to roughly $433,000 per unit.
What are the property taxes on 21 Hosmer St, Boston MA 02126?
Annual property taxes are $11,949 (2025), on an assessed value of $1,031,900.
What is the price per square foot?
At $1,299,000 for 4,056 sqft, that's about $320 per square foot.
Is there parking?
6 total parking spaces (off street).
Where is this property located?
21 Hosmer St, Boston MA 02126 is in Boston, Suffolk County, MA 02126.
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