Listing Tools

A rare opportunity to own a home just steps from Union Square, one of Somerville’s most vibrant and historic destinations, located only a quarter mile from the Green Line station. Nestled on a quiet side street at the base of Prospect Hill, where the first American flag was raised in 1776, 21 Stone combines neighborhood charm with urban convenience. From the private entry, you’re welcomed into an open light-filled living and dining space, where tall ceilings and large windows set a warm, inviting tone. The kitchen is both stylish and functional, with a southeast facing breakfast nook that captures the morning light. Additional perks include private laundry and storage in the basement, an off-street parking space, and shared patio ideal for outdoor gatherings. With award winning restaurants, cafs, and markets just around the corner, this home offers modern comfort rooted in the rich history and energy of Union Square.

More Info

Basic Information

  • Bedrooms2
  • Mls StatusUnder Agreement
  • Bathroom1
  • Contingency Pending P&S
  • Parcel Number 4587370
  • Unit Number#21

Tax Information

  • Tax Assessed Value $793,400
  • Tax Year 2025
  • Taxes$4,245

Parking

  • Parking Spaces1
  • Parking Features Off Street, Deeded

Rooms

  • Bathrooms Total Decimal 1
  • Full Bath1

Basic Information

  • List Price$849,000
  • MLS Number73500433
  • Modification Date05/13/2026
  • Property SubTypeCondominium
  • Purchase Contract Date05/05/2026
  • Virtual TourView Tour

Location

  • NeighborhoodUnion Square
  • SubdivisionUnion Square
  • Address21 Stone Avenue
  • Building Number21
  • CountyMiddlesex
  • StateMA
  • StreetStone Avenue
  • TownSomerville
  • Zip02143

Building

  • BasementN
  • Building Area Units Square Feet
  • Construction Materials Frame
  • Entry Level 1
  • Patio And Porch Features Patio
  • Rooms5
  • Stories1
  • Year Built1900
  • Year Built Details Approximate
  • Year Built Source Public Records

Interior

  • Flooring Hardwood

Exterior

  • Exterior Features Patio
  • RoofShingle

Utilities

  • Cooling Window Unit(s)
  • Cooling YN Yes
  • Heat SystemYes
  • Heating Baseboard, Steam, Natural Gas
  • Sewer Public Sewer
  • Water Source Public

Property Information

  • Square Feet1,021
  • Building Area Source Public Records
  • Living Area 1,021
  • Lot Size Units Acres
  • Structure Type 2/3 Family

Amenities

  • Amenities
    • Bike Path
    • Highway Access
    • Park
    • Public School
    • Public Transportation
    • Shopping
    • T-Station
    • Walk/Jog Trails
  • Appliances IncludedRange, Dishwasher, Refrigerator, Freezer, Washer, Dryer
  • Other AmenitiesBasement
  • PetsYes w/ Restrictions

Legal

  • ZoningCC

Other

  • Association Fee $250
  • Association Fee Frequency Monthly
  • Association Fee Includes Water, Sewer, Insurance, Reserve Funds
  • Date Listed04/13/2026
  • Farm Land Area Units Square Feet
  • View Count5

Map Location

Driving Directions

Listed by The Moving Greater Boston Team of Berkshire Hathaway HomeServices Warren Residential

Hi there! How can we help you?

Contact us using the form below or give us a call.

Send Us A Message:

I agree to receive marketing and customer service calls and text messages from Castles Unlimited. To opt out, you can reply 'stop' at any time or click the unsubscribe link in the emails. Consent is not a condition of purchase. Msg/data rates may apply. Msg frequency varies. Privacy Policy.

Do not fill in this field:

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Hi there! How can we help you?

Contact us using the form below or give us a call.

Send Us A Message:

Do not fill in this field:

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Hi there! How can we help you?

Contact us using the form below or give us a call.

Send Us A Message:

Do not fill in this field:

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Do not fill in this field:

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Do not fill in this field:

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Do not fill in this field:

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

$

Do not fill in this field:

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.