It's the world-renowned Classic Space Head Quarters! Here they plan all of the stuff they do in the world of classic space... I wouldn't have a clue as to what that is, you'd have to ask someone who makes CS MOCs on a regular basis, 'cause I don't! : P
The whole MOC.
The walkway that runs along the side of the building.
And a pic of the structure in the back...
I hope you enjoyed it! (I just whipped it up this afternoon!)