From the Los Angeles Times:
"Sorkin buys a separate wing
Aaron Sorkin, creator of "The West Wing," recently purchased a Beverly Hills home for his wife, from whom he is separated, at a selling price of just under $5 million. Sorkin's wife, attorney Julia Bingham, filed for divorce in November 2004.
The two-story traditional, built in 1937, was completely renovated earlier this year. The four-bedroom, 5 1/2 -bathroom home has a new kitchen-great room; a den with a fireplace; a large media room with a fireplace; a guesthouse; and a pool with a fountain."
See Toby Ziegler and Andy Wyatt and 4th season episode "Commencement."