Prospect Hill

21 Stone Ave #21

$850,000

● Condo - Off Market

21 Stone Ave #21

Somerville, MA 02143

2 Beds

1 Bath

1,021 Ft²

$731,586

RealtyHop Estimate

1.61%

Since Jul 1, 2022

MA-Boston

Primary Model

About This Property

A rare opportunity to own a home 100 yards from Union Square–and only ¼ mile from the new T stop. Right in the heart of the square, 21 Stone is nevertheless tucked away beautifully on a side street, at the foot of Prospect Hill. A private front entry leads you into the main space, where high ceilings, ample windows and freshly refinished floors make the open plan living and dining area shine. The kitchen is smartly designed, including a great southeast facing breakfast nook. Private laundry and additional storage are in the well-lit basement. At the back of the house there is one off-street parking space and a lovely shared patio area.

Unit Size

1,021 Ft²

Days on Market

Land Size

Price per sqft

$705

Property Type

Condo

Property Taxes

$190

HOA Dues

$200

Year Built

1900

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Last updated: 4 months ago (MLSPIN #72976387)

Price History

Date / Event	Date	Event
Jun 11, 2026	Sold	Premium
Sold
May 11, 2026	In contract	-
In contract
Apr 13, 2026	Listed by Berkshire Hathaway HomeServices Warren Residential	$849,000
Listed by Berkshire Hathaway HomeServices Warren Residential

	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.
Jun 8, 2022	Sold	Premium
Sold
May 4, 2022	Listed by Compass	$720,000
Listed by Compass

Property Highlights

Parking Available

Parking Details

Parking Features: Off Street

Interior Details

Full Bathrooms: 1

Laundry Features: In Building

Rooms: 5

Basement: Y

Exterior Details

Has Property Attached

Square Footage: 1021

Year Built Source: Public Records

Year Built: 1900

Building Area Total: 1021

Building Area Units: Square Feet

Construction Materials: Frame

Patio and Porch Features: Porch, Patio

Lot Size Units: Acres

Water Source: Public

Financial Details

Tax Assessed Value: $583,800

Tax Annual Amount: $2,283

Utilities Details

Cooling Type: None

Heating Type: Baseboard, Natural Gas

Sewer : Public Sewer

Location Details

HOA/Condo/Coop Fee Includes: Water, Sewer, Insurance

HOA Fee: $200

HOA Fee Frequency: Monthly

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Comparables

Past Sales

Date	Unit	Beds	Baths	Sqft	Price	Closed	Listed By
20260413 Unit 21 04/13/2026	21	2 Bed	1 Bath	1021 ft²	$849,000 2 Bed 1 Bath 1021 ft²	$836,000 -1.53% 06/11/2026	The Optimium Team eXp Realty LLC - Corporate Office
20220504 Unit 21 05/04/2022	21	2 Bed	1 Bath	1021 ft²	$720,000 2 Bed 1 Bath 1021 ft²	$850,000 +18.06% 06/08/2022	Jonathan Mitchell Compass