I am a GC who helped complete a two house project in CA for an owner/builder customer. I have a signed contract for my services. I was not paid in full and am owed approximately $23,000.00 for project management. I was promised I'd be paid once the property was sold; It sold on approximately April 4th and I just recently found out. The customer has refused to pay me the balance. Can I still file a lien now that it's sold? The last materials reimbursement invoice was paid on 4/7/22 and the customer paid one of 5 outstanding invoices for project management on the same date (the management fee was a flat fee for the project and progress payments were billed monthly.)