Richaven Architecture and Historic Preservation takes it’s name from the company founded by Brian’s grandfather in Tacoma, Washington after World War II.  Richaven Realtors sold houses in the Tacoma area for many years.  The 1952 photos below are described by the Tacoma Public Library Archive as:
Exhibit booth at the fourth annual Tacoma Home Show, April 3-6, 1952, for Richaven Realtors. The company was owned by Edward D. Rich, President and Broker, and Edith Pynchon Rich, Secretary- treasurer and was located at 2010 6th Ave. Their slogan was a word play on their last name, ” Rich Opportunities for Rich Living.” The booth has photographs of homes offered for sale through Richaven and advertises “low down payments.”
Images courtesy of the Tacoma Public Library, Richards Studio Collection Series: A66088-1