That's possible, too. Another friend has a daughter who lives in a house in Santa Monica and on the same property, behind the house is apartments the original owner built on the property. You don't get lots in SoCal anymore like they had back in the 20's and 30's...
http://terraserver.microsoft.com/image.aspx?T=4&S=8&Z=11&X=7403&Y=75563&W=3&qs=3646+Avenida+Del+Sol%7cStudio+City%7cCA%7c&Addr=3646+Avenida+Del+Sol%2c+Studio+City%2c+CA+91604-4020&ALon=-118.4079840&ALat=34.1365690
Nice aerial photo of 3546 and 3656 (I'd say they are the 2 brown roof homes. With Anna's being the one with the pool closer to the back of the house (pool looks more blue in the photo)
Yeah, I had a friend in Santa Fe who built the guest house first and lived in it for a long time, then built her big house in front when she got more money.