HWY 18 . Lots and Land for sale in Clear Lake, IA for $350,000. This 249,163 square foot property was built on a lot size of 5.72 Acre(s).. Zoned Commercial Highway, this property allows a new owner a multitude of possibilities conveniently located along Highway 18 on the north side of Clear Lake. Current parcel 00 has a survey that has been completed but not recorded. This new parcel from the ...