Proposed Appleplex: 1.4 mil sq ft (?), 12-13k employees
Pentagon: 6.5 mil sq ft (3.7 mil for offices), 26k employees
Empire State Building: 2.8 mil sq ft, 21k (?) employees
One of the things that isn't so nice now is the anti-radiation film that got placed on the windows after 9/11. The film is bright yellow, so everything that sunlight touches has kind of a gross pee colored tinge to it.
The GAO  does something close to auditing - although the Pentagon's financial statements aren't in the kind of shape that they even can be audited (something the GAO and DOD are working on). 
and I applaud your use of bracketed numbers, even if they are not blue. http://xkcd.com/906/
Wikipedia has more info: http://en.wikipedia.org/wiki/Human_scale