In anticipation of the 1926 sesquicentennial of the Declaration of Independence, Gréber created a plan for a mall north of Independence Hall in Philadelphia. This included a "Great Marble Court" surrounded on 3 sides by arcades (with each arch representing a U. S. state) and a pavilion at its center to house the Liberty Bell. It was not carried out; Independence Mall was created in the 1950s under a different plan. He also collaborated with fellow French-American architect Paul Cret on Philadelphia's Rodin Museum in 1926. He was not always popular with the press: a Philadelphia newspaper dubbed him "Jack Grabber".