The developers of the Copley Place expansion and a residential addition will present their plans to the Back Bay neighborhood tonight at the Boston Public Library.

Simon Property Group has proposed 114,000 square feet of new retail space, including a restaurant, and a 54,000-square-foot expansion of Neiman Marcus and the renovation of the existing store. A 47-story condominium tower that will house 280 condominiums at Dartmouth and Stuart streets also is planned. The developer is also expected to reveal plans for improvements to the public space around Copley Place.

The session will be held in the library’s mezzanine conference room at the main branch at 700 Boylston St. at 6:30 p.m.