Is it worth building Adu's in Orange County / Long beach ?

Hi everyone my is Carlos i am currently in Costa Mesa. I am planning on not resigning my lease and starting of my RE venture. I have done some research on ADUs and have come to conclusion that getting a house near a hospital or good college area with a big yard to add an adu and convert gargae to junior adu would be best. The only inssue is that i have not found many people in the area that have done it and would like to ask if any one here has done ADU's in Orange County or Long Beach and has it been worth it for you .

Thank you so much hope to hear some feed back !