Trans National Place, also referred to as 115 Winthrop Square, was a visionary proposal for a supertall skyscraper located in the heart of Boston, Massachusetts, United States. Originally conceptualized by renowned architect Renzo Piano, in collaboration with the Boston-based firm Childs Bertman Tseckares Inc., the project aimed to redefine Boston's skyline. However, the ambitious designs were ultimately shelved following Piano's departure from the project in March 2007.

The skyscraper was envisioned to be the tallest building in Boston, projected to exceed the height of the iconic John Hancock Tower by 15 stories and destined to reach at least 210 feet (64 meters).

Despite the initial excitement surrounding its potential, Trans National Place faced numerous challenges leading to its eventual cancellation in 2008. The primary factors contributing to this decision included a downturn in the commercial real estate market and considerable objections from the Federal Aviation Administration, which raised concerns over the building's proposed height being a hazard for air traffic near Logan International Airport. Ultimately, the project was superseded by the Winthrop Center, which later adopted a new design selected in 2016.

The proposed Trans National Place was more than just a building; it represented a bold vision of urban development that encapsulated the aspirations of Boston's architectural future. The combination of innovative design and modern amenities promised to enhance the city's landscape and generate substantial economic activity. Yet, as regulatory hurdles and market fluctuations intervened, the promise of this iconic skyscraper remained unfulfilled, leaving an indelible mark on Boston’s architectural narrative.

• List of tallest buildings in Boston
• List of cities with the tallest buildings
• Architecture of Boston
• Proposed buildings in the United States

• Entry on Skyscraperpage.com
• Emporis.com