QuadCorp Headquarters Building

I built this on a roleplay-economy server I play on, called HelloMiners, as the headquarters for the company I own on it, QuadCorp. On the side which the main-entrance is on (The east side) Is offices for my various employees, and on the other side (The west side) will be apartments going up from ground floor to the 25th floor, in a tower that extends out of the main structure. 
So far, I have received only praise from everyone who has seen it and been round it on the server, although I am very open to any (constructive, preferably) criticism. Apart from the Designers' offices on the 2nd floor, all of the east side of the building is complete. However, there is still alot of work to be done on the west side.
And do keep in mind, the HelloMiners Server is a survival one, so I constructed it in survival, without any worldedit or flight ability at my finger-tips, nor unlimited materials either.