Design Review Boards are pretty typical in planned communities such as Watercolor/Watersound, Rosemary and Alys Beach. Even the little community I live in, Seabreeze, has a DRB. Some are more restrictive than others but the general idea is to coordinate the style, building materials (roofs etc ), color pallet, size of building on lot size, towers etc. to maintain a "theme" throughout the community. Not for everybody and probably does add to the costs but the results can be a positive for the community at large.