One of Kansas City’s landmark buildings has a “For Sale ” sign. The Kansas City Power-and-Light building is 30 stories tall is on the National Register of Hisoric Sites, and comes with two acres of vacant property next to it. It’s yours for $17.5 million. KC Power and Light moved out in 1991 and other tenants have left since. The building’s only occupant now is an architectural firm that uses the first three floors.