Wilson Meany Sullivan is thinking bigger in Foundry Square.

The blue-chip development firm has filed an application to expand its Foundry Square III building by 75,000 square feet. If approved by the Planning Commission, the larger building at 525 Howard St. would grow the size of the proposed building from 178,000 square feet to 252,500 square feet, according to WMS principal Tom Sullivan.

The new design would add 50 feet of width to the proposed structure, in addition to another story. Sullivan said the expansion will make the building the same size as the other three Foundry Square structures, which house headquarters for Barclays Global Investors, Gymboree and the law firm Orrick, Herrington & Sutcliffe.

The expanded footprint is made possible by the fact that Wilson Meany Sullivan last year bought 525 Howard St., a single-story, 10,000-square-foot structure that functions as a Goat Hill Pizza by day and Club NV, a dance club, by night.

The site is adjacent to Wilson Meany Sullivan's proposed LEED Gold building development, Foundry Square III. Studios Architecture is designing the building.