In any commercial or business complex or building containing two (2) or more activities, each individual use may have a sign, not exceeding twenty (20) square feet in size, attached to or projecting from the building, provided that such signs do not project more than ten (10') feet from the building. In addition, a commercial or business complex may have a directory sign no more than ten (10) feet wide, consisting of one sign no more than three (3') feet high identifying the complex and individual signs no more than one and one-half (1 1/2') feet high identifying the individual activities.