Hit the shows and asked around. Theres always a good show happening almost every night in the LA area. However squats never seem to last long in southren california due to growing population and ever growing cost of living here most places that could be/are squats either get quickly turned over to athorities, boarded up, sold, or destroyed to make room for that mini-mall that is susposed to help somehow. Luckly theres a fairly good community built up around the punk scene that can normally help you find a place.