If an apartment owner conveys the apartment and assessments against the apartment are unpaid, the apartment owner shall pay the past due assessments out of the sale price of the apartment, or the purchaser shall pay the assessments, in preference to any other charges against the property except:
(1) assessments, liens, and charges in favor of this state or a political subdivision of this state for taxes on the apartment that are due and unpaid; or
(2) an obligation due under a validly recorded mortgage.