The redeveloper of the Government Center Garage in Boston, HYM Investment Group, has filed a letter of intent to build a 2.4 million-square-foot, mixed-use project including retail, office space, residential and transportation uses.

Little additional information was provided in the letter filed with the Boston Redevelopment Authority (BRA), which said it was delivered "by hand" to BRA Director Peter Meade.

The letter, signed by HYM Investment Group Managing Director Thomas O’Brien, says the project will have a "major residential component which will bring additional residents to an immediate area that often has little activity after [5 p.m.]."

With a site area of 176,549 square feet, the garage to be demolished is 11 stories, contains 2,300 parking spaces and holds 283,000 square feet of office and retail space. It is the city’s largest single parking structure.

"We are working hard developing a revised One Congress Street/Government Center Garage project that will reconnect neighborhoods that have been divided for decades," Thomas Palmer, spokesperson for The HYM Investment Group, wrote in an email. "We have a lot of ideas, and yesterday we signaled to the city that we plan to withdraw the existing plan and submit a new and scaled-down plan by the early fall. Our plans do not include adjacent Boston Police or Economic Development Industrial Corp. properties."

In 2008, Raymond Property Co. unveiled a $3.2 billion proposal for the site which included a pair of office towers encompassing 3.3 million square feet near Government Center. The tallest skyscraper would have been 52-stories, while the other would have reached 42 floors. That plan was scuttled by a combination of neighborhood opposition and a slow economy.