"The design of the downtown Convention Center was approved by the City Plan Commission Monday with the recommendation that the exterior walls be of precast concrete panels with a ribbed-face finish. The architects for the project, Hellmuth, Obata and Kassabaum and Jenkins-Fleming, had proposed either concrete or metal panels for the exterior walls. Norman Murdoch, director of the commission, said he felt that ribbed-faced concrete would be far more attractive, and he strongly favored it if costs could be kept within the construction budget. The Convention Center will feature a column-free 240,000 square feet of convention and exhibition space, the equivalent of five football fields in size."