21 Parker St Boston — Photo 1 of 41
$2,100,000
Investment Analysis — 21 Parker St
Boston, MA 02129 — Charlestown
Based on HUD Small Area Fair Market Rent for Boston-Cambridge-Quincy, MA-NH HUD Metro FMR Area, a 6-bedroom in 02129 carries an estimated $5,320/mo in gross rent — about a 1.88% cap rate and $39,516/yr in estimated NOI at the $2,100,000 list price. Adjust every assumption in the calculator below.
Beds
6
Baths
3
SqFt
3,290
Style
Single Family
Built
1875
Exceptional 4-story Charlestown residence offering 6 bedrooms, substantial living space, private outdoor space, and elevated Boston-area views. Set nearly 15 feet above Cambridge Street, this south-facing red-brick home offers an uncommon combination of privacy, natural light, and scale in one of Boston's most desirable neighborhoods. The remodeled kitchen and dining area feature rich mahogany cabinetry, premium marble surfaces, and elegant gold accents, while the spacious living room provides an inviting setting for everyday living and entertaining. The remodeled primary bath includes a Jacuzzi tub and smart bidet. Outside, a fenced yard and expansive newly paved patio create a private retreat for dining and entertaining. The remodeled second-floor balcony captures views of the illuminated Encore Boston Harbor and Boston skyline. Conveniently located near Sullivan Square and Assembly, with easy access to downtown Boston, dining, shopping, and transportation. A truly special Charlestown home offering exceptional flexibility, character, and city living. First showings Friday, Sep 18 5:00-6:30.
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: 900 sq ft (the lesser of 900 sq ft or half the 3,290 sq ft principal dwelling). Lot size: 1,470 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.
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Property Details
Financials
Parking
Interior Specifications
Climate & Utilities
Building & Exterior
Property & Lot
Amenities & Appliances
Gas Water Heater • Range • Dishwasher • Disposal • Refrigerator • Freezer • Washer • Dryer • Range Hood
Neighborhood
Public Transportation • Shopping • Park • Walk/Jog Trails • Medical Facility • Bike Path
Geography
Floorplan Breakdown
Structural Layout
Living Room
Lvl First15 x 14
Ceiling Fan(s), Flooring - Hardwood
Dining Room
Lvl First9 x 14
Flooring - Hardwood, Breakfast Bar / Nook, Recessed Lighting, Lighting - Overhead
Kitchen
Lvl First9 x 14
Flooring - Hardwood, Countertops - Stone/Granite/Solid, Countertops - Upgraded, Kitchen Island, Breakfast Bar / Nook, Cabinets - Upgraded, Open Floorplan, Recessed Lighting, Remodeled, Stainless Steel Appliances, Wine Chiller
Primary Bedroom
Lvl Third13.5 x 21
Closet, Flooring - Hardwood, Lighting - Overhead
Bedroom 2
Lvl Third13 x 15
Bedroom 3
Lvl Second15 x 14
Closet, Flooring - Hardwood, Lighting - Overhead
Bedroom 4
Lvl Second15 x 14
Closet, Flooring - Hardwood, Lighting - Overhead
Bedroom 5
Lvl Second9 x 9
Closet, Flooring - Hardwood, Lighting - Overhead
Bathroom 1
Lvl Third8 x 10
Bathroom - Full, Bathroom - Double Vanity/Sink, Bathroom - With Tub, Flooring - Stone/Ceramic Tile, Countertops - Stone/Granite/Solid, Countertops - Upgraded, Jacuzzi / Whirlpool Soaking Tub, Recessed Lighting, Remodeled, Window Seat
Bathroom 2
Lvl Second7 x 10
Bathroom - Full, Bathroom - Tiled With Tub & Shower, Flooring - Stone/Ceramic Tile, Countertops - Stone/Granite/Solid, Countertops - Upgraded, Remodeled, Lighting - Sconce, Lighting - Overhead
Bathroom 3
Lvl Basement7.5 x 8
Bathroom - Full, Closet - Linen, Flooring - Stone/Ceramic Tile, Handicap Accessible, Enclosed Shower - Fiberglass, Cabinets - Upgraded, Remodeled, Lighting - Overhead
Property History
$2,100,000
Sep 15, 2026
MLS® 73577599
$1,899,900
Aug 19, 2026
MLS® 73540375
$1,899,900
Jun 23, 2026
MLS® 73540375
$2,595,000
Sep 1, 2025
MLS® 73378651
$2,595,000
May 22, 2025
MLS® 73378651
Listing Agent: The Optimium Team
Listing Office: eXp Realty LLC - Corporate Office
MLS® Number: 73577599
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