Here is an example of BIM showing mechanical structural and architectural elements.

Mira Costa College Creative Arts Building

I worked as the Job Captain on this building. It served as a replacement for several nondescript buildings that were suffering from structural damage. It is three stories and houses students for the fine arts and music programs.

Calculating Allowable Area

I came across this website. It can help you to see if you have a viable basis for adding area to a project under the IBC. Please note that it will not work 100% for the California Building Code because it does not have the amendments built into it. However it is a good starting point.

Breaking it down

Sometimes it doesn't take much to break up a boring space. Take a look at this article on how to make dramatic changes with only electrical tape and foam core.