For sale

Price cut: $126K (7/20)

$1,499,000

99 Sumner St #Penthouse 621, Boston, MA 02128

2beds

1,197sqft

$10,802/mo

Get pre-qualified

Condominium

Built in 2021

-- sqft lot

$-- Zestimate^®

$1,252/sqft

$1,565/mo HOA

What's special

Fireplace loungeOpen-concept layoutBilliards roomHardwood floorsTwo garage parking spacesPrivate terraceQuartz countertops

Residence 621 at The Mark offers 2 bedrooms, a den, 2 baths, and 1,197 square feet of beautifully designed waterfront living, with two garage parking spaces and two storage units included. The open-concept layout features a chef's kitchen with Bosch appliances, quartz countertops, and upgraded cabinetry, all flowing across hardwood floors to a living space built for both everyday ease and effortless entertaining. The Mark is a full-service luxury building: 24-hour concierge, private terrace, fireplace lounge, billiards room, library, fitness center, conference room, and pet spa. Everything you need, without ever leaving the building. Downtown Boston is minutes away by ferry, Blue Line, or a quick drive. Logan Airport is moments from your door, making this a rare city residence that truly serves those with a dynamic lifestyle. Tallship, waterfront dining, and green space are all moments away. This is Boston waterfront living at its finest.

145 days

299

7

Facts & features

Interior

Bedrooms & bathrooms

Bedrooms: 2
Bathrooms: 2
Full bathrooms: 2

Heating

Forced Air

Cooling

Central Air

Appliances

Laundry: In Unit

Features

Flooring: Wood
Has basement: No
Has fireplace: No
Common walls with other units/homes: No One Above

Interior area

Total structure area: 1,197
Total interior livable area: 1,197 sqft
Finished area above ground: 1,197

Property

Parking

Total spaces: 2
Parking features: Under, Deeded
Attached garage spaces: 2

Features

Exterior features: Balcony, City View(s)
Has view: Yes
View description: City, Water, Harbor
Has water view: Yes
Water view: Harbor,Water
Waterfront features: Waterfront, Harbor

Details

Parcel number: W:01 P:05403 S:210,5200438
Zoning: CD

Construction

Type & style

Home type: Condo
Property subtype: Condominium
Attached to another structure: Yes

Materials

Brick

Condition

Year built: 2021

Utilities & green energy

Sewer: Public Sewer
Water: Public
Utilities for property: for Gas Range

Community & HOA

Community

Features: Public Transportation, Shopping, Park, Walk/Jog Trails, Bike Path, Highway Access, House of Worship, Private School, Public School, T-Station, University
Security: Intercom, TV Monitor, Doorman, Concierge

HOA

Amenities included: Hot Water, Fitness Center
Services included: Heat, Water, Sewer, Insurance, Security, Maintenance Structure, Maintenance Grounds, Snow Removal, Reserve Funds
HOA fee: $1,565 monthly

Location

Region: Boston

Financial & listing details

Price per square foot: $1,252/sqft
Tax assessed value: $1,168,200
Annual tax amount: $13,528
Date on market: 3/31/2026

Estimated market value

Not available

Estimated sales range

Not available

Price history

Date	Event	Price
7/20/2026	Price change	$1,499,000-7.8%$1,252/sqft
Source: MLS PIN #73493860 Report a problem
3/31/2026	Listed for sale	$1,625,000$1,358/sqft
Source: MLS PIN #73493860 Report a problem