Kan. Stat. § 19-1599
The board of county commissioners of any county having a population of more than two hundred fifty thousand (250,000) is hereby authorized to improve by repairing, remodeling or renovating any courthouse building constructed more than twenty-five (25) years before this act takes effect. Such board of county commissioners is authorized, in the alternative, to demolish and raze such a courthouse and construct other improvements on such old courthouse site for public record storage, parking or for any other county purposes authorized by law. Such old courthouse site may be leased to any public or quasi-public body for periods of not more than ten (10) years, and, if leased, the lease may provide that certain repairs, remodelings or renovating shall be done by the lessee or by the county.
K.S.A. 19-1599