Need help with evaluating a property

[David Sisson]

I'm looking into doing my first commercial purchase. The intent of this building is to be a home for my business (Architect's office) and also have extra units to rent. 

Can someone point me in the right direction to do the correct calculations to determine if it's a good investment and also to evaluate risk? 

I've never done a commercial property before. A commercial property is more interesting to me because I can get a SBA loan and purchase a much larger building with less down (10%) because my business will be in it.