21 Walnut # M Boston, MA $ 1,800,000
21 Walnut # M
$ 1,800,000
Recently Listed
Open House 7/16 3:30pm - 5pm
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21 Walnut # M

Boston, MA, 02108
$ 1,800,000
Bedrooms3 Baths2.0 Sq 1,038

Monthly Estimate*

$ 11,365

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Condo for sale in Boston, MA

for $1,800,000 with 3 bedrooms and 2 full baths. This 1,038 square foot condo was built in 1875 on a lot size of 0.02.

Just off iconic Chestnut Street, this exceptional Beacon Hill maisonette offers the rare combination of a private entrance, lush landscaped garden, and secluded patio in the coveted South Slope. Rich in architectural detail and filled with natural light from abundant windows and skylights, this elegant duplex lives like a private townhouse. The fireplaced living room opens to the private terrace, while the beautifully updated kitchen features stone countertops, custom cabinetry, and stainless appliances. A spacious den overlooking the garden provides an ideal home office or dining area. Upstairs are two generous skylit bedrooms, including a tranquil primary suite with large closets and a marble bath with radiant heated floors. Hardwood floors, Miele washer/dryer, air conditioning, and deeded storage complete this rare offering, just moments from Boston Common, the Public Garden, the Charles River,Esplanade and all and restaurants along nearby Charles St and the Back Bay.

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Open House

7/16/2026 3:30 PM - 5:00 PM
7/19/2026 1:00 PM - 2:30 PM
21 Walnut # M Boston, MA
* Some states or local ordinances may prohibit Open Houses at this time, please confirm with your Weichert agent or local rep to confirm

Condo Active

Price

$ 1,800,000

Bedrooms

3

Full Bath

2

Property Type

Condo

Taxes

$ 16,885

Style

Townhouse

Lot Size

0.02

Year Built

1875

Town/City

Boston

County/Region

Suffolk

MLS | Web ID

73549276

List By
Rebecca Davis Tulman and Leslie Singleton Adam

Listing Agent

Gibson Sotheby's International Realty

Broker

Affordability Calculator

$12,772
Per Month
89%
11%
0%
Monthly Principal & Interest
$11,365
Monthly Property Taxes
$1,407
Monthly Home Insurance
--
Default based on a 30-year fixed rate of 6.49% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.
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Pricing History
DatePricePrice ChangeDescription
7/14/2026$1,800,000 Listed Price

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21 Walnut # M, Boston, MA, 02108 is a Condo for sale at $1,800,000 with 1,038 sqft and a lot size of 0.02. 21 Walnut # M has 3 bedrooms, 2.0 baths, and was built in 1875. The property's zip code is 02108 which is in Boston, MA