tall building near the new hangar (Groom Lake)

Digging through my old Tikaboo photos, I noticed a tall building to the east of the new large hangar. The tall building is towards the center of this cropped photo.
tall building
Here it is processed differently:
tall building (alternate)

I have a few Groom Lake panorama at the bottom of this page which you can use for reference:
Area 51 panoramas

It looks taller than the new hangar door, though not as tall as the new hangar itself.