As previously reported by the Boston Business Journal , the developer behind the project is Kenmore

The owners of the Hotel Commonwealth located in Boston's historic Kenmore Square hotels in miami florida at 500 Commonwealth Avenue received the green light for a $45 million expansion project that will increase the building's existing capacity of 149 guest rooms by 60 percent.
As previously reported by the Boston Business hotels in miami florida Journal , the developer behind the project is Kenmore Hotel, LLC—an affiliate of hotel management, investment and development company Sage Hospitality of Colorado—which purchased the luxury boutique hotel in 2012 for $76.5 million from Boston University. The development team also includes Columbia hotels in miami florida Construction and Mortenson Development.
The seven-story, LEED certifiable addition designed by Group One Partners will replace a 23,000-square-foot open air parking site at the rear of the hotel which faces the Massachusetts Turnpike and Fenway Park. In addition to the 94 hotel rooms, the expansion project also includes three floors of private valet parking for 216 vehicles, a large ballroom, an outdoor terrace facing Fenway hotels in miami florida Park, five meeting rooms, and private event space.
Expected to open in mid-2015 after roughly 13 months of construction, hotels in miami florida the 133,400-square-foot structure is anticipated to generate nearly 100 construction jobs and 25 permanent jobs to support the operations of the new hotel facility, and approximately $1.03 million in annual property taxes for the City of Boston.