The film centers on a couple who find themselves in a heated real-estate bidding war when they put the house their New York house on the market. Nixon will play Keaton’s niece, who also happens to be her real estate broker.
Lori McCreary, Curtis Burch, Charlie Peters and Tracy Mercer will produce.
Nixon is best known for her role as Miranda on “Sex and the City” and last appeared in the 2011 crime-drama “Rampart.”
She is repped by WME.