Del. Code tit. 25, § 2233

All sums assessed by resolutions duly adopted by the council against any unit for the share of common expenses chargeable to that unit shall constitute the personal liability of the owner of the unit so assessed and shall, until fully paid, together with interest thereon at a rate not to exceed 18% per annum from the thirtieth day following the adoption of such resolutions, constitute a charge against such unit which shall be enforceable as provided in the next section.