Condominium at 99 Sumner # 612, Boston MA 02128
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$1,200,000

99 Sumner # 612, Boston MA 02128
Boston, MA 02128
Listed by Eain Williams
Bedrooms
2
Bathrooms
2
Living area
1,206 sqft
Year built
2021

About this home

Welcome to Penthouse Unit 612—where waterfront living meets comfort and convenience. Just minutes from Logan Airport and downtown Boston, The Mark provides 24/7 concierge service, deeded garage parking, extra storage, and thoughtfully designed spaces that elevate daily living—from the club room and golf simulator to the pet-washing station, yoga/fitness studio, and the inviting garden terrace with lounge.This 2 bed PLUS/2 bath penthouse features a sleek open kitchen with high-end appliances and a large island. The primary suite fits a king bed, includes two custom closets, and offers a spa-like ensuite with a glass shower. The additional bedroom and flex space provide excellent work-from-home potential.Enjoy harbor and Boston skyline views, plus easy access to Maverick T Station, Tall Ship, and ferries to the Seaport and Long Wharf—an ideal blend of serenity, views, and city living. Seller is motivated! Book an appointment for a private showing.

Highlights

Waterfront

Property details

MLS
MLS Property Information Network
MLS #
73478804
Property type
Condominium
Subdivision
N/A
Status
Active
Days on market
237
On market date
March 2, 2026
Stories
1
Total bathrooms
2
Garage spaces
1
Parking spaces
1
Lot size
N/A
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Nearby schools

Within 10 miles. School directory data from the National Center for Education Statistics (NCES), accessed via the Urban Institute Education Data API. Local Score is calculated by INNOVATE Real Estate; where a state rating is shown, it comes from that state's own official school report card.

Elementary
Dante Alighieri Montessori School
0.34 mi away · Grades -1-6
Nearest school -- attendance-zone data not available here
5.0
Local Score (student-teacher ratio only (preliminary -- will incorporate state test-score data once available)) -- not an official state rating
Enrollment
104
Student:teacher ratio
10.4:1
District
Boston
Middle
Joseph A. Browne School
1.77 mi away · Grades 5-8
Nearest school -- attendance-zone data not available here
4.0
Local Score (student-teacher ratio only (preliminary -- will incorporate state test-score data once available)) -- not an official state rating
Enrollment
540
Student:teacher ratio
12.3:1
District
Chelsea
High
East Boston High
0.97 mi away · Grades 7-12
Nearest school -- attendance-zone data not available here
4.0
Local Score (student-teacher ratio only (preliminary -- will incorporate state test-score data once available)) -- not an official state rating
Enrollment
1,111
Student:teacher ratio
12.2:1
District
Boston

Walkability

Blended score for Boston's center, calculated by INNOVATE Real Estate from two sources: the EPA's National Walkability Index (street network, transit, land-use mix) and Google Places amenity data (what's actually reachable on foot from this point). 60% EPA National Walkability Index + 40% nearby-amenity density (Google Places).

79
Walkable
out of 100
EPA National Walkability Index
13.0 / 20 -- Above average walkable
Google Places amenity density
100 / 100
Restaurants & cafes20
Grocery stores20
Parks20
Schools20
Transit stops20
Pharmacies11

Market position

How this listing compares to current activity in Boston, from live MLS data.

On the market 237 days -- 112 more days than Boston's current average of 125 days.
For reference, the median list price across 8,979 active listings in Boston right now is $80,000.

Mortgage calculator

Estimate only - actual rate and payment depend on your lender, credit, and loan program.

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Est. monthly payment
$7,377/mo
$240,000 down
$960,000 loan
Principal & interest$6,227
Property tax (est.)$1,000
Home insurance (est.)$150

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Data source: Listing information provided by MLS Property Information Network via Trestle/CoreLogic. Last updated June 10, 2026.

Information herein deemed reliable but not guaranteed; all measurements, school assignments, HOA fees, taxes, and feature lists are approximate and should be independently verified. Equal Housing Opportunity.