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21 Walnut M, Boston MA 02108
21 Walnut M, Boston MA 02108
Massachusetts>Boston>South Slope

21 Walnut MBoston, MA 02108

For Sale

$1,800,000

Smart Buyer Rebate $9,000

Just off iconic Chestnut Street, this exceptional Beacon Hill maisonette offers the rare combination of a private entrance, 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.

Listed by Rebecca Davis Tulman and Leslie Singleton Adam

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Gibson Sotheby's International Realty

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(617) 5105050

Last updated July 20, 2026

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Source: MLSPin #73549276

Listing Facts

  • TypeCondo
  • NeighborhoodSouth Slope
  • Bedrooms2
  • Bathrooms2
  • Days on Prevu17
  • HOA/Maint. Fees$1,000.73/month
  • Taxes$16,885/year
  • Size1,038 sqft
  • Price per sqft$1,734

Amenities

  • Private Outdoor Space
  • Pets Allowed

Location

Mortgage Calculator

Listing History

07/14/2026
Listed by Gibson Sotheby's International Realty
$1,800,000

Property Details for 21 Walnut M

Association

Amenities

  • Association Amenities: Hot Water
  • Community Features: Public Transportation, Shopping, Tennis Court(s), Park, Walk/Jog Trails, Medical Facility, Bike Path, Conservation Area, Highway Access, T-Station
  • Pets Allowed: Yes w/ Restrictions

Fees

  • Association Fee: $1,000.73 Monthly
  • Association Fee Includes: Heat, Water, Sewer, Insurance, Snow Removal

Exterior

Construction

  • Number Of Units Total: 11
  • Stories: 2
  • Stories Total: 2
  • Structure Type: Townhouse
  • Year Built: 1875
  • Year Built Details: Actual
  • Building Name: 1-3 Chestnut Street
  • Common Walls: Corner
  • Construction Materials: Brick
  • Entry Level: 1
  • Entry Location: Unit Placement(Courtyard)
  • Exterior Features: Courtyard, Patio - Enclosed, Garden

Features

  • Fencing: Security
  • Patio And Porch Features: Patio - Enclosed

Measurements

  • Building Area Total: 1,038
  • Building Area Units: Square Feet
  • Lot Size Acres: 0.02
  • Lot Size Area: 0
  • Lot Size Square Feet: 1,038
  • Lot Size Units: Acres

Financial

Taxes

  • Parcel Number: W:05 P:01573 S:006,4758964
  • Tax Annual Amount: $16,885.00
  • Tax Assessed Value: $1,458,100.00
  • Tax Year: 2025

Interior

Features

  • Fireplace Features: Living Room
  • Fireplace: Yes
  • Fireplaces Total: 1
  • Flooring: Flooring - Stone/Ceramic Tile
  • Interior Features: Closet, Entrance Foyer

Measurements

  • Living Area: 1,038
  • Living Area Source: Public Record

Rooms

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

Other

Features

  • Accessibility Features: No

Parking

Parking

  • Open Parking: Yes
  • Parking Features: On Street

Utilities

Equipment

  • Cooling: Heat Pump
  • Has Cooling: Yes
  • Electric: 110 Volts
  • Heating: Baseboard
  • Has Heating: Yes
  • Laundry Features: In Unit
  • Other Equipment: Intercom
  • Sewer: Public Sewer
  • Water Source: Public

Frequently Asked Questions

How many bedrooms and bathrooms does this condo have?

There are 2 bedrooms and 2 bathrooms in this condo at 21 Walnut M.

Are pets allowed at 21 Walnut?

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

What are the annual taxes for 21 Walnut M?

Annual taxes for this condo are estimated at $16,885.

How does 21 Walnut M compare to other condos in South Slope?

This condo is listed 30% below the average price for condos in South Slope and has been on the market for 67 less days than the typical home in this area.

What building or home owners association is the condo part of?

This condo is in the 1-3 Chestnut Street building.

What is the square footage on this condo?

According to the MLS, this listing is 1,038 sqft.

21 Walnut M is a 2-bedroom, 2-bath condo for sale in Boston MA 02108. On Prevu for 17 days at $1,800,000. This residence features 1,038 square feet of living space, located in South Slope. The median listing price for condos in this area is $3,695,000. The home offers private outdoor space and pets allowed. Explore more condo listings in Boston.

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.