Gracious south-facing Back Bay penthouse in the historic Hotel Agassiz, an 1872 Gothic Revival landmark by Weston and Reed, one of Back Bay's first "French Flats" buildings. Enter via a marble octagonal lobby with door attendant service to this meticulously restored, sun-filled 4,072 square foot, 3-plus-bedroom, 3.5 bathroom residence. A grand, skylit foyer with white oak floors and fine millwork leads to a formal dining room and family room with marble fireplace, custom built-ins, and Commonwealth Ave Mall views. The chef's kitchen boasts a 10' marble island, custom cabinetry, Sub-Zero refrigerator, pantry, and dedicated wine cooler. A sun-splashed sitting room, study with marble fireplace, and guest bedroom suite complete one wing; a primary suite with walk-in closet and marble en-suite bath, plus a second en-suite bedroom, anchor the private quarters. Central AC, ground-floor storage, and bike storage included. Steps to Newbury Street and the Esplanade.

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Basic Information

Bedrooms4
Mls StatusNew
Bathroom4
Parcel Number 3351450
Unit NumberPH61

Tax Information

Tax Assessed Value $5,613,600
Tax Year 2026
Taxes$65,895

Parking

Parking Spaces1
Parking Features Deeded

Rooms

Bathrooms Total Decimal 3.5
Full Bath3
Half Baths1

Basic Information

List Price$9,750,000
MLS Number73572912
Modification Date09/08/2026
Property SubTypeCondominium

Location

NeighborhoodBack Bay
SubdivisionBack Bay
Address191 Commonwealth Avenue
Building Number191
CountySuffolk
StateMA
StreetCommonwealth Avenue
TownBoston
Zip02116

Building

BasementN
Building Area Units Square Feet
Entry Level 6
FireplaceYes
Fireplaces Total 3
Rooms9
Stories1
Year Built1899
Year Built Details Approximate
Year Built Source Public Records

Utilities

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

Property Information

Square Feet4,072
Building Area Source Public Records
Living Area 4,072
Lot Size Units Acres
Structure Type Brownstone

Amenities

Association Amenities Elevator(s)
Other AmenitiesFireplace

Other

Association Fee $3,491
Association Fee Frequency Monthly
Association Fee Includes
- Electricity
- Insurance
- Maintenance Grounds
- Maintenance Structure
- Reserve Funds
- Security
- Sewer
- Water
Date Listed09/08/2026
Farm Land Area Units Square Feet

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Newton, MA

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Newton, MA