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21 Stone Ave 21Somerville, MA 02143

For Sale

$849,000

Smart Buyer Rebate $4,245

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, cafés, and markets just around the corner, this home offers modern comfort rooted in the rich history and energy of Union Square.

Listed by Jacqueline Vienneau

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Berkshire Hathaway HomeServices Warren Residential

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603-231-0089

Listed by The Moving Greater Boston Team

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Berkshire Hathaway HomeServices Warren Residential

Last updated April 21, 2026

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Source: MLSPin #73500433

Listing Facts

  • TypeCondo
  • NeighborhoodProspect Hill
  • Bedrooms2
  • Bathrooms1
  • Days on Prevu17
  • HOA/Maint. Fees$250/month
  • Taxes$4,245/year
  • Size1,021 sqft
  • Price per sqft$832

Amenities

  • Dishwasher
  • Private Outdoor Space
  • Washer/Dryer
  • Pets Allowed
  • Parking

Location

Mortgage Calculator

Listing History

04/13/2026
Listed by Berkshire Hathaway HomeServices Warren Residential
$849,000

Property Details for 21 Stone Ave 21

Association

Amenities

  • Community Features: Public Transportation, Shopping, Park, Walk/Jog Trails, Bike Path, Highway Access, Public School, T-Station
  • Pets Allowed: Yes w/ Restrictions

Fees

  • Association Fee: $250.00 Monthly
  • Association Fee Includes: Water, Sewer, Insurance, Reserve Funds

Exterior

Construction

  • Number Of Units Total: 3
  • Roof: Shingle
  • Stories: 1
  • Stories Total: 1
  • Structure Type: 2/3 Family
  • Year Built: 1900
  • Year Built Details: Approximate
  • Construction Materials: Frame
  • Entry Level: 1
  • Exterior Features: Patio

Features

  • Patio And Porch Features: Patio

Measurements

  • Building Area Total: 1,021
  • Building Area Units: Square Feet
  • Lot Size Units: Acres

Financial

Taxes

  • Parcel Number: 4587370
  • Tax Annual Amount: $4,245.00
  • Tax Assessed Value: $793,400.00
  • Tax Year: 2025

Interior

Features

  • Appliances: Range, Dishwasher, Refrigerator, Freezer, Washer, Dryer
  • Flooring: Hardwood

Measurements

  • Living Area: 1,021
  • Living Area Source: Public Record

Rooms

  • Basement: N
  • Bathrooms Full: 1
  • Bathrooms Total Integer: 1
  • Bedrooms Total: 2
  • Rooms Total: 5

Parking

Parking

  • Open Parking Spaces: 1
  • Parking Features: Off Street, Deeded
  • Parking Total: 1

Utilities

Equipment

  • Cooling: Window Unit(s)
  • Has Cooling: Yes
  • Heating: Baseboard, Steam, Natural Gas
  • Has Heating: Yes
  • Laundry Features: In Building
  • Sewer: Public Sewer
  • Water Source: Public

Frequently Asked Questions

How many bedrooms and bathrooms does this condo have?

There are 2 bedrooms and 1 bathroom in this condo at 21 Stone Ave 21.

Does this condo have parking?

Yes, there is 1 parking space available for 21 Stone Ave 21.

Are pets allowed at 21 Stone Ave?

Yes, 21 Stone Ave allows pets. Check the Property Details for any relevant restrictions.

What are the annual taxes for 21 Stone Ave 21?

Annual taxes for this condo are estimated at $4,245.

How does 21 Stone Ave 21 compare to other condos in Prospect Hill?

This condo is listed 43% below the average price for condos in Prospect Hill and has been on the market for 4 less days than the typical home in this area.

What is the square footage on this condo?

According to the MLS, this listing is 1,021 sqft.

21 Stone Ave 21 is a 2-bedroom, 1-bath condo for sale in Somerville MA 02143. On Prevu for 17 days at $849,000. This property features 1,021 square feet of living space, located in Somerville. The median listing price for condos in this area is $1,950,000. The home offers private outdoor space, dishwasher, pets allowed, parking, and washer/dryer. Browse more condo listings in Somerville.

The property listing data and information, or the Images, set forth herein were provided to MLS Property Information Network, Inc. from third party sources, including sellers, lessors, landlords and public records, and were compiled by MLS Property Information Network, Inc. The property listing data and information, and the Images, are for the personal, non commercial use of consumers having a good faith interest in purchasing, leasing or renting listed properties of the type displayed to them and may not be used for any purpose other than to identify prospective properties which such consumers may have a good faith interest in purchasing, leasing or renting. MLS Property Information Network, Inc. and its subscribers disclaim any and all representations and warranties as to the accuracy of the property listing data and information, or as to the accuracy of any of the Images, set forth herein.

Full MLS Disclaimers

Rebate estimate is indicative only and based on listing price and estimated buyer's agent commission paid by owner, if applicable. Final rebates are subject to Terms of Use and may vary due to final negotiated transaction terms.