640 River Street, Boston, MA 02126
For-sale six-unit multifamily with multiple two-bedroom layouts and convenient transit access in Mattapan.
- Added:
- Jan 9, 2026
- Days on Market:
- 177
- Last Refresh:
- Jul 5 at 1:54 am
Property Features for 640 River Street
General Information
- Standard status
- Active
- Size
- 5,448 SF
- Property subtype
- Multi-Family
Building Details
- Year Built
- 1920
Listing office Karen M. Overtoom R.E. (978) 578-5013
Listing date Jan 9, 2026
Source Churchillprop
Displayed information is deemed reliable but is not guaranteed and should be independently verified.
All listing content including descriptions, pricing, images are the copyrighted material of Karen M. Overtoom R.E.
HighLights
- 6‑unit multifamily building built in 1920
- All units are 2‑bedroom / 1‑bathroom layouts
- Mattapan location with proximity to the Mattapan Line and multiple bus routes
- Convenient access to Blue Hill Avenue and corridors connecting to downtown Boston
- Walkable area near local dining, retail, and community amenities
Overview
Located in Mattapan, the property benefits from access to the Mattapan Line and multiple bus routes. The remarks also reference nearby key corridors, including Blue Hill Avenue, providing convenient connectivity to downtown Boston and surrounding submarkets. The area is characterized as walkable, with local dining, retail, and community amenities.
This asset may appeal to buyers seeking a straightforward small multifamily investment with consistent unit mix and straightforward tenancy targeting for 2-bedroom households. Prospective owners can review the existing rent roles and plan for unit-turn improvements in line with the stated focus on in-unit upgrades and releasing, while leveraging the building’s transit-oriented setting for day-to-day tenant convenience.
Local Financial Insights For Apartment 5plus
Simulate Cap Rate and NOI
NOI Build-Up
- Vacancy
- income lost from leasable area expected to sit empty during the year — subtracted from gross rent.
- EGI (Effective Gross Income)
- gross rent minus vacancy losses — the realistic income before paying operating costs.
- OpEx (Operating Expenses)
- recurring costs to operate the property (property tax, insurance, utilities, maintenance, management) — excludes financing and capital improvements.
- NOI (Net Operating Income)
- income a property generates after operating costs but before financing and taxes.
| Component | $ | $/SF |
|---|---|---|
| Gross rent | $241.9k | $44.40 |
| − Vacancy | −$9.2k | −$1.69 |
| EGI | $232.7k | $42.71 |
| − OpEx | −$104.7k | −$19.22 |
| NOI | $128.0k | $23.49 |
Alternative Uses
Current Use by Public Records
Location Insight
- Map
- Local Demand
- City
- Boston
- County
- Suffolk
- State
- Massachusetts
- Longitude
- -71.07087
- Latitude
- 42.35811
