Since it’s the PM you’re dealing with, I’m assuming you’ve signed the standard lease form by CAR. It states that “in the event of termination by Tenant prior to completion of the original term of the Agreement, Tenant shall also be responsible for lost Rent, rental commissions, advertising expenses and painting costs necessary to ready Premises for re-rental. Landlord may withhold any such amounts from Tenant’s security deposit.” So legally neither the PM nor the owner can go after you unless you damaged the rental that costs more than the deposit to fix. Also since you’ve advertised and found the new tenant, the PM should not charge you the 30% either. I think it’s just an excuse to get some money from you. If you’ve shown good faith and got everything in writing, there’s no need to worry.