No one knows where to get information on this question ?
Yes we do but you are in California and there is almost no such thing as below market rents and in some buildings the waiting list to get in can be 2 tor 3 years. Anyway lots of Blah, Blah, Blah because all you have to do is go to google and type in rent control studies and research in California. There are numerous sites including government agencies you can contact. You can also contact your local AI or ASA chapter and they can direct you to research papers and you can even take a course where you will real appraisers who do not Blah, Blah, Blah go and finally you can take a test and get their official Rent Control Appraisers Certification. Once I come across that below market rent building in Los Angeles I know
"Pushin-Value & Associates" can do it