Virtual Building Logistics

I seem to be seconded to the facilities group at my 250-person company, now in the process of looking for a new (smaller, sleeker, cheaper) corporate office space. They're looking to me for guidance on quantifying cost and carbon benefits in the location envelope, and say they'll be looking for goal numbers and ground-truth as they compete redesign/buildout. I know how to do this and I dread doing it with Excel. Does anyone have experience with using CAD models as the basis for environmental (thermal, power, sunlight, etc.) simulation?

There is actually a firm called (drum roll) Virtual Building Logistics (http://vblogistics.com/) who do exactly this. They start with CAD drawings and use tools to render them in 3D, and then use other tools to simulate mechanics and other aspects of using the space.

Check out studiowikitecture dot wordpress dot com - they have a wiki-based 3D architecture visualization system