Danish architecture practice Schmidt Hammer Lassen (SHL) have unveiled images of their new design for the Seaport World Trade Center in Boston.

The architects'' intervention will see the maritime landmark – once the largest pier building in the world – expanded to include 15,200 sq m of public realm.

Located on the 118-year-old Commonwealth Pier, the new mixed-use property will play host to a waterfront plaza with multiple courtyards, promenades, dining outlets, retail shops, and offices.

Currently the World Trade Center, which was developed in the 1980s by The Drew Company – a firm associated with the site's current owner, Fidelity Investments – functions as an expo facility and hotel.

SHL, who are working with CBT Architects on the project's master plan, will also preserve select decorative elements of the building, such as its cornice and stone arches, while bringing out its columned facade.

"This project is about more than designing a building," Kristian Ahlmark, partner and design director at SHL said in a statement.

"As a pioneer development in the now thriving Seaport District, the Seaport World Trade Center revitalisation project demanded an architectural design that would activate the waterfront location and celebrate the uniqueness of the building," commented Andrew Dankwerth, senior vice president of design and development for Pembroke, Fidelity Investments' real estate division.

He continued: "Schmidt Hammer Lassen enriched the workplace, event, and retail uses by integrating public realm spaces throughout the site – fundamental elements of a vibrant new Commonwealth Pier."

Construction is expected to get underway in 2020.