Other items to be mindful of include camera tilt. This controls the location of the vanishing points or whether vertical lines will converge or not if you aren't familiar with the other terminology.
Camera height used will determine whether the ceilings appear high and airy or low and restrictive. Use it to create your desired impression. Much that is published in magazines is shot at chest height to give a sense of vertical space.
If you can obtain even one flash, perhaps negotiable with your employer, it is possible to use it to light paint on select surfaces and then combine the images as layers in PhotoShop giving amazing levels of control over the lighting in the scene. A light yellow gel will do wonders for warming things up a bit and create some contrast with cooler shadows.