Two-Family Development
For Sale
$1,199,000
401 W 4th St, Boston, MA 02127
MULTI_FAMILY - Boston, MA
Property Size2,795 SF
Lot Size0.03 Acres
Price / SF$428.98
Days on Market53
Property Features for 401 W 4th St
General Information
Property type
Residential Multi Family
Property subtype
Other
Property condition
Under Construction
Zoning
R1
Bedrooms
5
Bathrooms
5
Full bathrooms
5
Rooms
Bathroom 2, Bedroom 2, Bathroom 5, Bedroom 5, Bathroom 1, Bathroom 3, Bedroom 4, Bathroom 4, Bedroom 1, Bedroom 3
Directions
F st and W 4th st.
Subdivision
South Boston
Standard status
Active
APN
W:06 P:01094 S:000,1412683
Size
2,795 SF
Lot size
0.03 Acres
Taxes and HOA fees
Tax Year
2025
Tax Annual Amount
10222
Building Details
Year built
1900
Floors in Building
4
Number of units
2
Listing Agency:
Keller Williams Realty
(617) 969-9000
Listed By:
Keller Williams
(617) 969-9000
Added: Jun 9
Changed: Jul 28
Last Checked: Jul 31 at 7:06AM
MLS# 73532773
Copyright © 2026 MLS Property Information Network Inc. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.
Investment Insights
Based on property information with market context.
This property offers an opportunity to develop a four-floor two-family with approved plans included in the sale. The building currently features three floors of living space totaling four bedrooms, along with a partially finished walk-out basement with tenants in place through August 2026.
The property is zoned R1. The included plans contemplate both units as duplex-style configurations with generous square footage, and the offering also notes the ability to extend the living area further by maximizing the by-right FAR of 2.0. The current setup and the included approvals are designed to support redevelopment into the intended two-family structure at 401 W 4th St in Boston, MA 02127.
The property is zoned R1. The included plans contemplate both units as duplex-style configurations with generous square footage, and the offering also notes the ability to extend the living area further by maximizing the by-right FAR of 2.0. The current setup and the included approvals are designed to support redevelopment into the intended two-family structure at 401 W 4th St in Boston, MA 02127.
Key Highlights
- Under construction; building year built listed as 1900
- Approved plans included to convert from a single‑family to a 4‑floor two‑family
- Current setup includes 3 floors of living space and 4 bedrooms
Financial Insights For Multifamily LT 5
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 | $105.7k | $37.80 |
| − Vacancy | −$4.8k | −$1.70 |
| EGI | $100.9k | $36.10 |
| − OpEx | −$30.3k | −$10.83 |
| NOI | $70.6k | $25.27 |
2,795 SF · lease $37.80/SF/yr · vacancy 4.50% · expense 30.00%
Alternative Uses
Best Use
Multifamily LT 5
$1.01M
$882.9K – $1.18M
NOI $70,628 @ 7.0% cap · market cap 5.89%
Second Best
Apartment 5plus
$938.0K
$820.8K – $1.09M
NOI $65,660 @ 7.0% cap · market cap 5.48%
Theoretical Best
Office A
$2.09M
$1.83M – $2.44M
NOI $146,503 @ 7.0% cap · market cap 12.22%
Zoning and permitted uses should be independently verified with authorities.
Property Analytics
Property Profile
Current Use
Lease Details
2
Residential units
Turnkey business
Opportunity
Location Intelligence
Trade Area within ½ mile
2,156
Businesses Nearby
Explore this area
Business Placement
Demographics for 02127, MA
37,939
Population
19,495
Households
1.9
Avg Household Size
31
Median Age
69%
College-Educated
95%
High-School Grad
2.1 sq mi
ZIP Area
18,066
Density / Sq Mi
$156,373
Median Household Income
$85,444
Median Earnings
$2,435
Median Rent
$858,600
Median Home Value
Market
Vacancy Rate% for Multifamily in Northeast region
Questions? Ask Rey
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Frequently Asked Questions
What type of property is this?
Duplex - Approved plans included for a four-floor two-family, with tenants in place through August 2026.
Where is this duplex located?
The property is located at 401 W 4th St Boston, MA.
What is the asking price?
The asking price for this property is $1,199,000.
What are key features of this property?
This property features: Under construction; building year built listed as 1900; Approved plans included to convert from a single‑family to a 4‑floor two‑family; Current setup includes 3 floors of living space and 4 bedrooms
