Boston’s largest modular housing development well on its way in Charlestown

In early May, the first 129 modular boxes arrived at the construction site of the Graphic, an apartment complex slated for 32 Cambridge Street in Charlestown.

The two-building project will include a four-story one constructed from such boxes, stacked and engineered to form 125 apartments above 97 parking spaces. It represents the largest example of modular housing in Boston.

Each box clocks in at 30,000 to 35,000 pounds, and is 60 to 65 feet long. It takes about 20 minutes to lift each into position, and workers can arrange 14 boxes a day.

A redevelopment of the former Graphic Arts Finishers Building is providing the other property in the two-building project. That building will have 46 apartments.

All totaled, the Graphic will host 171 loft-like apartments; 113 parking spots; 4,000 square feet of retail and restaurant space; and amenities such as a club room, a game room, bike storage, a fitness center with yoga facilities; a private courtyard; and a roof deck.

And it’s all just across from the Sullivan Square stop of the Orange Line. Now that the stacking is well underway, the Graphic is expected to welcome its first tenants in October.

Berkeley Investments is its developer; ICON Architecture its architect and Tocci Building Corp. its general contractor. RCM Group manufactured the boxes.