99 Sumner St #506, Boston, MA 02128

$850,000 · For sale

This home is in The Mark, a 107-unit condominium building built in 2019.

99 Sumner St #506, Boston

Bright, well-appointed 1+ den opportunity with parking at The Mark on East Boston’s waterfront. Elegant & distinctive interior finishes throughout the building & home. Oversized windows flood the open living space with natural light & courtyard/water views. The kitchen features Silestone quartz counter tops, Bosch appliances & an island perfect for entertaining. The Primary bedroom has charming views of courtyard and water, and the versatile den is perfect for a home office/second bedroom. Enjoy ample closet space and storage solutions throughout including a deeded storage unit conveniently located on the same floor. The Mark is a full service building with amenities including: 24/7 concierge, fitness center with flex studio, harbor view resident terrace with grills and fire pits, golf simulator, conference rooms, entertainment suite, and pet spa. Modern community in a prime Eastie location — easy access to dining, transit and waterfront. A turnkey opportunity for seamless city living.

About this address

99 Sumner St #506 is a 1-bedroom, 1-bath condo for sale in Boston, MA 02128 with 783 square feet, asking $850,000. It has been on our site since August 7, 2026.

The median asking price among the 386 other 1-bedroom condos for sale in Boston is $649,900. This one asks about 31% more. At $1,086 a square foot, it compares with a median of $846 among the 1575 other condos for sale in Boston with a stated size.

At 783 square feet, it is larger than 69% of the 386 other 1-bedroom condos in Boston with a stated size.

This home is assessed at $669,300 for fiscal year 2023. It last sold for $869,900 in August 2021.

It scores 100 out of 100 for walkability, from how close everyday places are.

The closest train or subway stop is Maverick (MBTA Blue Line), about 0.1 miles away. The closest bus stop is Maverick (MBTA routes 114, 116, 120), about 0.1 miles away.

The closest public schools by level are Alighieri Dante Montessori School (0.2 miles) and East Boston High School (0.9 miles). The district decides which school serves an address.

Listing information from MLS Property Information Network (MLS PIN), MLS #73490155, deemed reliable but not guaranteed. Prices are compared with other homes listed on this site today. Trains and buses come from the transit agencies’ published schedules and schools from the National Center for Education Statistics. Distances are straight-line. Assessed values and past sales are public records from municipal assessors, published by MassGIS. An assessed value is set for taxation and may differ from market value.

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