All sums assessed by the council of co-owners but unpaid for the share of the common expenses chargeable to any apartment shall constitute a lien on such apartment prior to all other liens except only (1) tax liens on the apartment in favor of any assessing unit and special district, and (2) all sums unpaid on a first mortgage of record. Such lien may be foreclosed by suit by the council of co-owners or the representatives thereof, acting on behalf of the apartment owners, in like manner as a mortgage of real property. In the event of any such foreclosure, the apartment owner shall be required to pay a reasonable rental for the apartment if so provided in the bylaws, and the plaintiff in such foreclosure shall be entitled to the appointment of a receiver to collect the same. The council of co-owners or the representatives thereof, acting on behalf of the apartment owners, shall have power, unless prohibited by the declaration, to bid in the apartment at foreclosure sale, and to acquire and hold, lease, mortgage and convey the same. Suit to recover a money judgment for unpaid common expenses shall be maintainable without foreclosing or waiving the lien securing the same.