That can if that is the rental or lease agreement for your space in the rental home park. There is nothing illegal about passing on a share of property taxes to a renter--it's simply a matter of what was agreed between you and the park. If there is a written agreement between you and the park, they can only charge you the taxes if the agreement says they can; if the agreement does not state that, they can look to add them when the agreement expires and is up for renewal. If there is only an oral agreement, if the taxes are part of that agreement, they can charge them now; otherwise, they have to give you 30 days notice they are adding an amount for the taxes to the agreement.