The 5,200-square-foot property, which sits on a street with million-dollar homes, came on the market in late July at $495,000 and closed in early September.
Each unit has one bedroom and one bathroom for a total of about 1,600 square feet of living space. There are lake and city views.
Mark, 24, has appeared as intern Steve in more than two dozen episodes of "Grey's Anatomy" (2007-09) and in various roles on "All That" (1997-2005). Deanna, about five years his senior, has worked in the costume and wardrobe departments of a dozen TV shows.
Mark is a first-time home buyer, and Deanna previously owned a condo. The pair say they are looking forward to living upstairs/downstairs to each other, according to Brent Watson of Coldwell Banker, Beverly Hills, who had the listing and also represented the Sauls.
Although originally built in 1939, the duplex has a late '60s vibe. They are planning a major updating and renovation to give it a modern feel, Watson said.