I'm a HOA president in PA. I don't know how differenct laws are between PA & CA but here's my two cents. Ultimately it is the homeowner's (the guy who is renting the place out) responsibility to make sure association rules and regulations are followed. We've had similar situations where renters could care less about the rules and regs. We started assessing (fining) the homeowner for every rule broken and reg not followed. When it starts to hit him in the wallet he'll take the action on the renters, keeping everyone else outta the retaliation crosshairs. He could charge assessments back to his renters, hitting them in the wallet, and they'll either tone it down or get pissed and break the lease and pack up and move. He might even have a case for eviction if his lease agreement is written correctly.