Total Square Footage 11,405,960
Total Dollar Volume $1,275,135,400.00


Established 1981
Website WS Development
Phone Number 617-232-8900

Proud Member Of:

One of the largest privately owned retail development firms in the United States, WS Development develops, owns, manages, and leases an extensive portfolio of over 88 properties totaling more than 20 million square feet and 4 million under development. The company is based in Chestnut Hill, MA. 


Seaport Square Parcel P
- Mar 04, 2020

Site Work Begins on Seaport Square Parcel P Site work is underway for the upcoming 626,000 square foot lab/office project at 400 Summer Street.  The Seaport building will be home to Foundation Medicine, who have leased 580K square feet. As part of the project, a new set of stairs including public open space will be built to connect Summer Street down to Congress Street.

Seaport Square Block L4
- Feb 25, 2020

Foundation & Garage Construction Continues on Seaport Square Block L4 Work continues on the foundation and underground garage for Seaport Square Block L4. The 17-story office building is expected to open in 2021. When completed, the tower will be Amazon's Seaport office and will house around 2,000 employees.

Seaport Square Parcel P
- Feb 14, 2020

$236M Building Permit Pulled for 400 Summer Street Suffolk Construction has pulled a building permit valued at $236M to kick off construction of 400 Summer Street in the Seaport. The upcoming 16 story lab building will feature 625,000 square feet of space including 30,000 square feet of retail space. Foundation Medicine has leased 580,000 square feet of laboratory and office space at the project.  The development will also involve the construction of a grand public stair connecting Summer and Congress Streets.

Seaport Square Block L4
- Dec 29, 2019

Tower Crane in Place for Amazon's Future Seaport Office Tower The tower crane is up at Seaport Square Block L4, for what will be home to Amazon's Seaport office. The 17-story tower will feature 444,000 square feet of office space above, 81,000 square feet of retail. Approximately 2,000 Amazon employees will work from this new location when it opens sometime in 2021.

Seaport Square
- Dec 04, 2019

Snowport Winter Village Opens Tomorrow in the Seaport Seaport is thrilled to introduce a new winter entertainment destination in Boston: Snowport Winter Village in Partnership with Fjällräven & Capital One Café. Debuting tomorrow, Thursday, December 5th, and open through February 2020, Snowport Winter Village is an interactive winter wonderland featuring a signature ice skating rink and an array of complimentary winter activities, from iceless outdoor curling to yoga and warm beverages. By mid-December, Snowport Winter Village will serve freshly baked waffles by The Waffle Cabin, along with more great things to be announced. Snowport Winter Village spans over 7,000 square feet in total and will be located at 65 Northern Ave (the intersection of Seaport Boulevard and Fan Pier Boulevard). Snowport Winter Village’sice rink spans over 3,000 square feet and accommodates more than 200 skaters. It will host a variety of winter festivities, such as vibrant light displays, outdoor iceless curling, yoga, seasonal workshops, live music, and themed skate nights. Come mid-December, Snowport Winter Village will also include a warming tent complete with seasonal food and beverage options for skaters and observers alike to enjoy.“As our largest and most dynamic public activation yet, Snowport Winter Villagecreates an entirely new gathering place in Seaport. Snowport Winter Village will provide ample opportunities to experience the season, offering ice skating for families and neighbors; seasonal food and beverage to enjoy with friends, and winter games for all ages. Our hope is to offer an open, welcoming, and festive new destination for the whole neighborhood to enjoy.” says Yanni Tsipis, Senior Vice President, Seaport, WS Development.  

Seaport Square Block N
- Nov 15, 2019

BPDA Approves NPC For Seaport Square Block N On 11/14 the Boston Planning Board approved the notice of project change for The Seaport Square Block N project. Original plans for the building had called for primarily residential use but the updated project will now include around 38,000 square feet of retail/restaurant and 384,000 square feet of office and research and development space.

Seaport Square
- Oct 31, 2019

Permit Pulled For Temp. Ice Rink in Seaport Square A permit has been pulled to build a temporary ice rink in Seaport Square at 65 Northern Avenue. During the summer the site is home to the Cisco Beer garden but will now be transformed into a skating rink that will run through March of next year.  

Seaport Square Block N
- Sep 12, 2019

NPC Filed for Seaport Square Block N WS Development has filed a notice of project change for Seaport Square Block N, at 350 Summer Street. The NPC calls for a change of use from a primarly residential building to office/lab space. Original plans included 72,000 square feet of retail/restaurant space and 350,000 square feet of residential while the NPC proposes a reduced 38,000 square feet of retail/restaurant and around 384,000 square feet of office and research and development space.

Seaport Square Parcel P
- Aug 01, 2019

Foundation Medicine Leases 580,000 Square Feet at 400 Summer Street WS Development has announced that Foundation Medicine has leased 580,000 square feet of laboratory and office space at 400 Summer Street, part of the company’s 23-acre Boston Seaport development. “We are honored that Foundation Medicine has chosen 400 Summer Street for their headquarters. Boston’s Seaport has come to serve as the city’s hub for forward-thinking employers, residents, and retailers, and now as a global hub of the life sciences sector. No company better represents the power of innovation than Foundation Medicine and we are proud to welcome them to our neighborhood,” said Jeremy Sclar, President of WS Development. The upcoming 626,000 square foot, 16 story lab/office project at 400 Summer Street. will include a new set of stairs including public open space to connect Summer Street down to Congress Street.

Seaport Square Block L4
- Jul 23, 2019

Work Continues on Foundation/Below Grade Parking for Seaport Square Block L4 Construction is ongoing for the foundation and two levels of below-grade parking at Seaport Square Block L4, future home of Amazon. Block L4 will feature 444,000 square feet of office space above two levels of retail, 81,000 square feet. The project will also bring a new park to the area, connecting Summer Street to the Waterfront, Harbor Square Park will be a 1/3 mile public promenade designed by the world-renowned landscape architecture firm James Corner Field Operations, possibly best known for their work on Manhattan’s High Line.  Construction on Seaport Square Block L4 is expected to be complete in 2021.

Seaport Square Parcel P
- Jul 18, 2019

WS Development Plans to Begin Construction on 400 Summer St. Later This Year At yesterday's NAIOP Seaport by Foot Tour event, Yanni Tsipis of WS Development discussed a few of his firm's upcoming projects in Seaport Square. With work underway for Amazon's future home at Seaport Square Block L4, WS expects to begin construction on Parcel P next, later this year. Parcel P, or 400 Summer Street, will include over 600,000 square feet of lab space and is aesthetically designed to connect Fort Point's industrial style with The Seaport. As part of the 400 Summer Street project, WS will be building a new connection between Summer and Congress Streets. These gorgeous new stairs will include public space and allow for a much more pleasant pedestrian connection than the current A Street Stair option.

Seaport Square Block L4
- Jun 13, 2019

Seaport Square Block L4 Financed for $435 Million The project at Seaport Square Block L4 has been financed via Citizens Bank for $435 million. The upcoming project consists of a 17 story retail and office building to be constructed on a 1.63-acre parcel in Boston's Seaport Square. The 525,000 square foot building will feature 81,000 square feet of retail space on the first two levels accompanied by 444,000 square feet of office space on the upper 15 levels.

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