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621 East Fourth Street Boston — Photo 1 of 36

$1,295,000

Investment Analysis — 621 East Fourth Street

Boston, MA 02127

Based on HUD Small Area Fair Market Rent for Boston-Cambridge-Quincy, MA-NH HUD Metro FMR Area, a 3-bedroom in 02127 carries an estimated $4,540/mo in gross rent — about a 2.88% cap rate and $37,244/yr in estimated NOI at the $1,295,000 list price. Adjust every assumption in the calculator below.

View Standard Listing

Beds

Baths

2.5

SqFt

1,341

Style

Single Family

Built

1905

Rare opportunity to own on a premier Southie block! This home perfectly bridges quiet residential comfort with immediate urban access. Enjoy being steps away from East Broadway's dynamic dining and shopping scene, while living just five blocks from the sprawling South Boston waterfront. From coastal runs on William J. Day Boulevard to beach days at M Street and Carson, the ideal coastal city lifestyle awaits.

ADU Potential

Massachusetts allows one accessory dwelling unit by right in single-family zoning districts statewide (M.G.L. c. 40A §3; 760 CMR 71.00, effective Feb 2025). Estimated maximum ADU size for this property: 671 sq ft (the lesser of 900 sq ft or half the 1,341 sq ft principal dwelling). Lot size: 1,372 sq ft.

Based on listing data, which indicates the property type — not the zoning district. Local dimensional, septic (Title 5), and historic-district requirements still apply. Not legal advice — verify with the municipality.

Estimates — not financial advice

These figures are illustrative estimates for informational purposes only — not an appraisal, valuation, or guarantee of rent, income, or returns, and not financial, tax, or investment advice. Rent is either the figure reported on the MLS listing — in-place rent that may differ from market and is not verified against the actual leases — or, where the listing reports none, an estimate from HUD Small Area Fair Market Rents, a government benchmark that may differ from actual market rent. Each figure is labelled with its source. Cap rate, NOI, and returns depend on the assumptions shown, which you can change. MLS and other third-party data may be inaccurate or out of date. Verify all figures independently and consult your own financial, tax, and legal advisors before making any investment decision.