My thoughts - avoid the cheapest tools out there. You shouldn't really need all that much - I would think a full set or so of hex wrenches, phillips and slotted screwdriver, needlenose pliers, and adjustable wrench, a chain tool, tire levers, and a pump would probably be all you need. A ratchet set is always nice as well, but often not necessary. I don't see any reason to need cone wrenches or bottom bracket tools if this is just for employees to make some quick repairs, unless you want to provide them.

Since you have badge access, I am going to guess you have a security office, as well? If so, a nice amenity would be to stock up on some common size tubes that someone who needed one could purchase, or take. I wouldn't stock many, but someone needing an emergency tube would sure appreciate having access to one if needed.