This is what we have found inside. 

Welcome to the basement, after pumping out 5 feet of water. Water tanks and distribution.

Controls emerged.

Documentation in the "copper room" an peeling paint from the copper covered walls.

Tell that to the pigeons!

Pigeons were here and "marked"  whole second floor like this.

After AT&T left, time passed, pigeons came, messy and smelly all around.

Typical picture all over the building, leaking roof, peeling paint, crumbling walls, rusty hardware.

Got some coax?

Cannibalized transmitters (no guts) and antenna hybrid couplers.

What's left of the past high power glory.

...and after some cleanup:

Entrance to the cafeteria/shack at the second floor.

View of the future shack room, previously used as a cafeteria.

Shack room with door to the rooftop patio. Peeling paint, crumbling walls, leaking roof.

Transmitter alley on the second floor.

Old transmitters with most of the guts cannibalized.