Are you aware that California Penal Code sections 530.5-530.8 require the law enforcement agency in the area of an identify theft victim to take a police report?
https://leginfo.legislature.ca.gov/faces/codes_displayText.x...
Also, we're not in California. We reported to our local PD, who did call us to get additional information, but obviously isn't going to spend a lot of time on something they can't do anything about. Oakland PD could presumably visit the apartment and see who's there or something.
Most of the things you're supposed to do revolve around documenting things (which allowing a police report does), so that when these accounts get reported on credit reports later, you can contest them and they'll be dropped. But in the mean time, there's nothing to be done about a fraudulent lease.