OK, same building/shell as my previous but in a more finished version.
Exterior: Added columns to windows on the 2 side buildings for depth.
Added exterior doors to the front of side buildings
Added random lamps for exterior lighting.
Added full canopy and pillars to rear entrance with flush lighting
Interior: All floors are done.
Added floors all the way up. Every 2 windows is 1 story.
Each floor has a different color carpeting
Each floor has flush lighting in ceilings to look like fluorescent lights.
Added full glass elevator shaft from bottom to top, with the exception of the final 3 floors (VIP type rooms) which have their own separate ways of getting up.
Added Chandelier and lamps throughout main entrance room (see pic)
Added spiral lamps to the 2 adjoining rooms (see pic)
Added dual chandeliers and large area glowstone floors covered in white carpet (see pic)
Added random plants throughout lower floors only
Other things like size/details of the building itself can be found in my other "shell only" upload description.