Allen Center original plan. The first two towers were completed to plan. A planned shopping mall under a glass roof and a theater (lower right) were never built. Del Oro development. View is intersection of 288 and the South Loop. Houston Center. The mother of all developments. Only towers were built according to the original master plan. United Bank Plaza. The section on the left was never built. Menil Guest House by Luis Barragan, 1984. This would have been built adjacent