A little later in the same game these bonuses quit stacking.  I didn't notice it until after I built a barracks, so possibly that was the trigger.  At the time I first saw the effect I had one hero with Admin III and the other was at Admin I.  Right now I have a III and a II, since the lower level one has been roaming around gaining exp, and only returned to town to heal up a little.

OK more info, w pics and a save game.  Somehow my primary city became broken, and now has a 20% PENALTY to training and construction times.  Also Admin I/II/III is having no impact on gildar generation, the way it claims to.

Here's a city with no Administrative bonuses.  It does have a barracks however.  Notice the gildar generation rate.

Here is the same city w an Admin III hero.  Notice the giant bonuses to training and building times.  Also note the gildar rate did not change even though Admin III is supposed to provide a bonus to income.

OK here's the part that I think is unbalanced.  Stacking Administrator II and III look at the training and building times.

Here's a bonus bug I found.  I was working on a Metropolis strategy, and this is my primary city.  Notice what happened, somehow, to the training and building times.  They now have a 20% PENALTY.  Somehow this happened when I was moving heroes in and out of the city, possibly with an interaction w the barracks.  I don't know exactly.  Exiting the game and reloading the save fixes the issue, but you have to notice it's happening and then reload to fix it otherwise the penalty is very definitely in effect.

- Manii Names

Agree, good work! I failed to get Administrator leveled in my games.