Image courtesy of RISE Together and CBT Architects

Nearly 13 acres of commercial properties in the Inner Belt section of Charlestown are the next potential landing spot for life science and multifamily housing growth as a development partnership seeks approval for a 2.6 million-square-foot project.

Developers RISE Together and TRAX said the initial phase of development would include 906,000 square feet of office-lab space and 160 housing units on 6 acres west of Interstate 93. The parcels on Cambridge, Carter and Crescent streets include low-rise buildings occupied by businesses ranging from a veterinary hospital to Boston Paper Board.

Future phases would be clustered on Spice Street and a group of parcels on Temple, Cambridge, Arlington, Dorrance, Alford and Sherman streets known as the Mystic Square phase, according to a notification letter submitted to the Boston Planning & Development Agency.

“Sullivan Square is dominated by expressway, street and heavy rail infrastructure. Although unusually transit-rich, it offers little in the way of urban character, neighborhood amenities or fertile soil for 21st-century industries,” attorney Donald Wiest of Dain Torpy wrote in the letter.

Designs by CBT Architects call for a total of 2.6 million square feet of development including 1,325 housing units in a three-phase project. Developers will seek separate approvals for each of the three phases. Developers said 20 percent of the housing would be income-restricted.

The project team includes VHB, PORT Urbanism, KRM Consulting and RISE Construction Management.

The scale of the project would accelerate changes to the landscape along the industrial western edge of the neighborhood.

The owners of Hood Business Park are proposing a 6-story addition to the parking garage at 100 Hood Park Drive to add 154,700 square feet of office-lab space, part of the continuing redevelopment of the 20-acre property.

Developer Related Beal recently acquired three parcels for $74.5 million and proposes a 101,000-square-foot R&D building to replace a self-storage facility at 420 Rutherford Ave.

And Newton-based Fulcrum Global Investors is proposing a 29-story, 695-unit apartment tower called One Mystic at the corner of Mystic Avenue and Dorrance Street.