Is the Centerpoint Energy Plaza building in downtown Houston have an observatory in its upper floors?

I would like to go to the upper floors of a really tall building, but most buildings don't permit this after Sept. 11, 2001. I live within driving distance of downtown Houston and have heard that Centerpoint Energy Plaza building has a restaurant way up there. Does anyone know anything about this building? If not, does anyone know of an alternative building? I want this mainly for sightseeing at night.