423 Beacon Street, Unit 2, Back BayBoston, MA 02115MLS Number 73598711

  • Price: $4,500,000
  • Est. Mortgage of $/month
  • 1 Day on Market
$
$
%
$/month over payments
Federal 30-year interest rate: 7.24% last updated on Oct 29, 2026
* All Figures are estimates. Check with your bank or proposed mortgage company for actual interest rates.
This product uses the FRED® API but is not endorsed or certified by the Federal Reserve Bank of St. Louis.
  • 4Bedrooms
  • 0.06Acreage
  • 4Bathrooms
  • 1869Year Built
Active
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Cape Coastal Sotheby's International Realty
Cape Coastal Sotheby's International Realty
Office: 508-477-6688
540 Falmouth Road (Mashpee Rotary)
Mashpee, MA 02649
A Back Bay penthouse that lives like a townhouse. A private entry and a single flight of stairs bring you to the main level, and the primary suite is just one flight above, so day-to-day living stays on two floors. The top floor and a private roof deck are there whenever you want them. One of only two residences in a classic brownstone, with deeded parking. The main level is made for entertaining. A 21-foot living room opens to oversized bay windows over the tree-lined street, anchored by a gas fireplace in a warm wood surround with built-in shelving alongside. The dining room flows back to the kitchen, with custom cabinetry, a Wolf range, a Sub-Zero refrigerator and a generous center island made for gathering. One flight up, the primary floor is a true retreat: a bedroom with its own bay window, a dressing hall lined with built-in closets, and a five-piece marble bath with a tub and a separate shower. A second bedroom at the rear works beautifully as a guest room or office. The top floor adds two more bedrooms and two full baths, including a front bedroom with its own fireplace and wet bar that doubles as a media room or guest suite. Just above, the private roof deck, more than 300 square feet, takes in the Back Bay skyline and becomes an outdoor living room from spring through fall. Fully renovated, with 11-foot ceilings on the main and primary floors and 10-foot ceilings above, walnut-stained white oak floors, radiant heated bath floors, integrated sound, refined millwork, central air and in-unit laundry. Pet friendly, with Newbury Street and the Esplanade minutes away.

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Basic Information

  • Bedrooms4
  • Mls StatusNew
  • Bathroom4
  • Listing Terms Contract
  • Parcel Number W:05 P:03515 S:004,5043103
  • Unit Number2

Location

  • NeighborhoodBack Bay
  • SubdivisionBack Bay
  • Address423 Beacon Street
  • Building Number423
  • CountySuffolk
  • StateMA
  • StreetBeacon Street
  • TownBoston
  • Zip02115

Property

  • Acreage0.06

Interior

  • Flooring Tile, Hardwood, Flooring - Stone/Ceramic Tile
  • Interior Features Bathroom - Full, Bathroom - Tiled With Tub & Shower, Lighting - Sconce, Bathroom, Wet Bar

Property Information

  • Square Feet2,539
  • Building Area Source Public Records
  • Living Area 2,539
  • Lot Size Square Feet 2,539
  • Lot Size Units Acres
  • Structure Type Brownstone

Tax Information

  • Tax Assessed Value $3,707,700
  • Tax Year 2026
  • Taxes$45,975

Basic Information

  • List Price$4,500,000
  • MLSPIN 73598711
  • Modification Date11/04/2026
  • Property SubTypeCondominium

Building

  • BasementN
  • Building Area Units Square Feet
  • Common Walls No One Above
  • Construction Materials Brick
  • Entry Level 2
  • FireplaceYes
  • Fireplace Features Living Room
  • Fireplaces Total 2
  • Patio And Porch Features Deck - Roof
  • Rooms7
  • Stories3
  • Utilities For Gas Range, For Electric Dryer, Washer Hookup
  • Year Built1869
  • Year Built Details Actual, Renovated Since
  • Year Built Effective 2017
  • Year Built Source Public Records

Amenities

  • Amenities
    • Bike Path
    • Highway Access
    • House of Worship
    • Laundromat
    • Medical Facility
    • Park
    • Private School
    • Public School
    • Public Transportation
    • Shopping
    • T-Station
    • University
    • Walk/Jog Trails
  • Appliances IncludedRange, Dishwasher, Disposal, Microwave, Refrigerator, Washer, Dryer, Wine Refrigerator, Range Hood
  • Other AmenitiesFireplace
  • PetsYes
  • Security Features Intercom

Parking

  • Parking Spaces1
  • Parking Features Off Street, Deeded

Rooms

  • Bathroom 1 First,5 x 2.5
  • Bathroom 2 Second,9.583333333 x 14.083333333
  • Bathroom 3 Third,7.583333333 x 5.5
  • Bathrooms Total Decimal 3.5
  • Bedroom 2 Second,9.416666666 x 16.5
  • Bedroom 3 Third,16 x 16.416666666
  • Bedroom 4 Third,16 x 17.666666666
  • Dining Room First,9.5 x 11.333333333
  • Full Bath3
  • Half Baths1
  • Kitchen First,16.333333333 x 16.416666666
  • Living Room First,16.25 x 21.083333333
  • Master Bedroom Second,16

Exterior

  • Exterior Features Deck - Roof
  • RoofRubber

Utilities

  • Cooling Central Air
  • Cooling YN Yes
  • Heat SystemYes
  • Heating Central
  • Sewer Public Sewer
  • Water Source Public

Other

  • Association Fee $951
  • Association Fee Frequency Monthly
  • Association Fee Includes
    • Insurance
    • Maintenance Grounds
    • Maintenance Structure
    • Reserve Funds
    • Sewer
    • Snow Removal
    • Water
  • Date Listed11/04/2026
  • Farm Land Area Units Square Feet
  • Other Equipment Intercom
  • View Count1

Driving Directions

Listed by Hans Nagrath of Compass

Back Bay Boston, MA Demographics

There is no data available

Back Bay Boston, MA Real Estate Market Data

There is no data available

Back Bay Boston, MA Schools

School NameDistanceTypeGrades

The property listing data and information, or the Images, set forth herein were provided to MLS Property Information Network, Inc. (MLSPIN) from third party sources, including sellers, lessors and public records, and were compiled by MLSPIN. 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 or leasing 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 or leasing. MLSPIN 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.

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