At 61 stories, it's being billed as the tallest building to be constructed in New England since the early 1970s.
Boston Mayor Marty Walsh was among those on hand Wednesday evening for a groundbreaking for the city's newest skyscraper.
The $750 million project at 1 Dalton St., on the Christian Science Plaza, will house a Four Seasons hotel — Boston's second — and some of the city's most expensive condominiums.
Construction is expected to be completed in 2017.
The Back Bay mixed-use proposal was OK'd by the Boston Redevelopment Authority last year.
It was designed by John Hancock Tower architect Harry Cobb, of Pei Cobb Freed, and Gary Johnson of Cambridge 7 Associates, according to a spokeswoman from the PR firm Rasky Baerlein.
The spokeswoman added in a release: "London, Shanghai, Singapore, Los Angeles, Chicago and Istanbul are the only cities that are home to two Four Seasons hotels."
This article was originally published on January 14, 2015.