1-i heard a contractor who does a job of more than few hundred dollars must have a license. is that true? 2-california. can an unlicensed contractor/subcontractor who did a job of $5000 put a lien on the property? 3-the property is commercial and the owner has a contract with the tenant, which states that the tenant must pay for all the interior expense. can the contractor still put a lien based on that? 4- what to do if there is going to be a lien? 5- would contractor be in trouble if required to have a license and not having one? 6- no written contract with tenant, can he still put a lien if no contract?