Global coordinates, is not the terminology used by Cad. You probably mean World Coordinates. Your UCS icon should have a tiny square box where the vertical and horizontal lines meet. If there's no box, and your UCS doesn't, it means the UCS is not currently in World Coordinates. I speculate the drawing has been rotated about 18.5-degrees clockwise. I know this by looking at the VIEW CUBE in the upper right.
If the building (or property boundary) is a rectangle, then it was rotated to make two walls run left-to-right and the two other walls run straight up-and-down. Without rotation, the building's exterior walls wouldn't be parallel to the sheet edges and everyone would get a sore neck reading the drawing--and we don't want that. If you were to make both true north and the view cube point straight up then both your x- and y-axes would be angled instead of horizontal and vertical.
To investigate, type "+UCSMAN" (without the quotes) on command line, then 0 enter. In the next dialog, on the Named UCSs tab, you'll see World and a secondary UCS if the original author decided to name it. If he didn't bother, it will show UNNAMED.
Just because the author indicated northings and eastings and decided to rotate the view, doesn't necessarily mean his drawing is geo-referenced. He still needs to tie to a 'Known Coordinate System' such as State Plane mucha-ma-call-it, US-ft or UTM Zone ??, NAD83, meters. (I doubt, though, otherwise the view cube wouldn't be rotated.) To me, looks like a 'local' coordinate system, commonly referred to as a 'site specific' CS.
Chicagolooper
