I walked all around the outside and it appears that the exterior stonework had been cleaned in the recent future because it looks almost new.

The front has a series of what looks to original wrought iron gates that opens to a small tiled, courtyard with a a bunch of French doors with curved top lights:



Look at the great stone work at the entrance:



They've obviously added this glass vestibule but it could easily be removed -- it's not even used now:



This is the westside of the building with a nice little courtyard. It's hard to see, but it has the same curved-top French doors and all the stonework and details look tip-top:



Here are the tracks in the back. Whatever structures were next to tracks are gone and there are just some concrete foundations. Also, there are tons of docks back there, which I guess were used primarily for mail back in the day:





The eastside with another great little courtyard:





A couple of plaques from the outside -- you can also get a feel for how good the stone looks on the entire building. I'll see if I can transcribe the last one from a high-res image.