Your situation is pretty hopeless as far as reception of either AM or FM signals;
1) Most office bldgs have a lot of metal in their construction, making it an effective shield can.
2) Practically everything in the bldg except perhaps the water cooler generates spurious RF over a wide band of frequencies.
With a commercial tuner--one that is completely shielded, and with an rf coil instead of a loop on the back cover or a ferrite loopstick, and with a coaxial fitting on the back for antenna input--would do well in such environment if the pure, uninterfered signal is piped in from a remote (perhaps on the roof) aerial through a properly connected and dressed coaxial cable.
Back in the '60s--unless the Gestefax was busy perforating a mimeograph stencil, or there was a plethora of flourescents nearby--your nifty table radio would've worked fine. Today is a whole new can o' worms--sorry to say.
