I found it. Permission to use Open House signs. See Master Declaration Article III Section 4 Signs prohibited --- No Sign of any kind, other then temporary open house signs, shall be displayed in or on the Common Areas without the written consent of the Association.

Master Declaration Article X section 10 Signs --- No signs of any kind shall be displayed on Lots or Units with the exception of "For Sale" or "Open House" signs. "For Sale" signs are restricted to one (1) on premises sign (on or in the window) with the sign not to exceed four (4) square feet in size. "Open House" sign shall not be located within fifteen (15) feet of any property line, right of way or access easement. Ward Shaw