The Downtown Community Alliance has announced the opening of Nest Gallery, located on the first floor of the U.S. Bank Building at 520 Walnut St. The gallery, which opens on April 7, will offer exclusive artwork by artist James Ellwanger and also serve as the central hub for Ellwanger's "Spectrum on Walnut", a proposed retail lighting display for Walnut Street. An open house will be held on April 4 from 4-7 p.m. in the lobby of U.S. Bank. Regular business hours will be 11 a.m. to 5 p.m., Monday through Friday.