A mansard sign. Because the sign needs a roof that large over it.
Also weird because the Gerber Chapel building is one of Webster's important historical buildings. It was built in 1865 as the Nathan Allen Home. I believe it is the same "ALLEN" that plotted Soulard and thus Allen Street.
The front of the building is not mansard style but a simple Victorian Vernacular style. Greek columns were added later. Yuck. The real party starts in the back of the building with a shingle/mansard funeral carport. A total botch of Victorian, Greek Revival and 1970's Mansard. Upon reflection, i should have taken some pictures of the front so readers could enjoy the mullett-ness of Gerber Chapel.