I just found out something new about the KSC menu: You can right click on buildings to repair any damage even if it is still operational. It will also list the varying degrees from damage by "Light," "Moderate," "Critical" and "Out of service." For example, if you destroy 3 out of 4 of the structures around the launch pad (but not the pad itself) then it will be fine, but destroying all 4 of them will render it out of service, even though the concrete pad is untouched. Also the tracking station can still work with one dish broken, but wreck 2 dishes and it's dead.