Kansas' CCH law is still in it's infancy (took effect 01/01/2007) and as originally written, had no wording which prevented posting of parking lots. With the passage of HB 2528, several things changed. The two items pertinent to this conversation (from the AG's web site) are:
Also changed with HB 2528, business owners (both public and private) may continue to post their buildings to restrict the concealed carry of firearms, but parking lots are no longer allowed to be posted.We're learning.
Employers, both public and private, may continue to restrict a licensed employee’s ability to carry concealed while they are performing the duties of their employ, but licensed employees are allowed to store their firearm in their private means of conveyance, even if parked on company property.