Yes, you are correct, the 9A report is only required for properties located within the City of Los Angeles, not the entire county. For any specific requirements for retrofitting in other areas, it is best to check with the local city's Department of Building & Safety. I am not aware of any retrofitting requirements for the city of San Gabriel, but it would be best to check with the City to be sure. Let me know if you have any questions.
Coldwell Banker Residential Brokerage
Here is a copy of the 9A Report (see link below), Under "OWNERâ€™S DECLARATION" you will find the "Requirements" for the retrofit. Hope this will help you...