Hi, I am in California. I am a landscape designer and gardener that has not been paid, as well as my worker, after many attempts. I have sent the invoice over email multiple times. He claimed the check was stolen from the mail and he would resend it but has stopped responding to my emails since. I have added a late fee and let him know I would have to proceed with a lien if we were not paid. Do I need to file the lien in the county where the work was done- Sonoma, or where I live- Mendocino? Also I was reading I need to file a preliminary notice. Where I did the work was the clients vacation home, how do I find out their primary residence in order to send the preliminary by certified mail? Do I and my co-worker need to file separate liens since we are both self-employed?