Foundation work on the seven-level, 3,400-space structure is expected start this week.
The garage will be completed in about 20 months, while the casino, hotel and entertainment complex is slated to open in late 2018.
This announcement comes a week after Massachusetts casino regulators approved the redesign of the property. The Massachusetts Gaming Commission, meeting in Springfield, voted unanimously to approve the site plan and design for the US$950m casino project, which has undergone significant changes since the five-member commission awarded MGM a license almost two years ago.
Citing a need to control rising construction costs, MGM officials last fall revealed plans to downsize the project by roughly 10 percent. The most striking change is the elimination of a 25-story glass façade hotel tower from the original plans.
Plans approved by the gaming commission include the casino gaming floor, a six-story, 252 room hotel, a 3,400 space parking garage, and space for amenities such as restaurants, a bowling alley, movie theater, and outdoor plaza that will have an ice skating rink in the winter.