We are a plumbing contractor in California. We were called out by the owner of a condo for drain issue. upon further diagnosis we determined that a portion of the drain line needed to be replaced due to lack of grade and a belly in the sewer line. We gave a proposal for a repair on the sewer line which the owner then submitted to their condominium HOA , their HOA contacted us and said that they assumed liability for the repair and approval was made for us to proceed per their property management company. The property management company signed the proposal for approval for us to complete the following day. The repair was complete and now the HOA is not paying us. Whom do we lien in this situation? The work was all performed on the condo owner's property so would we file the mechanic's lien to them? or the HOA, or the property management company or all three? Please advise! Thank you