Eventually, it made more sense to put them in the San Fernando Valley. It also opened more opportunities since a lot of people in Los Angeles look down on the Valley. It has some of the richest neighborhoods in the city, but some people ignore the hills and only think about areas like Pacoima, Van Nuys and Panorama City.
But I still wanted someone to live in Santa Monica, at least part time. So I'm putting one of the characters into a house on Palisades Avenue, near 4th Street. It's a nice little neighborhood near the park, with a large beach and ocean just down the cliff. I don't know what it would cost to actually live there, but it's next to Montana Avenue and close to the Third Street Promenade. I'm guessing it's a little pricey.
I wrote a quick scene between two of the characters on the beach that hopefully says a lot about their relationship in a short conversation.