Rlwiley,
You are correct, you are not an engineer, but you ARE an Electrician. As such, it should be a simple thing for you to sit down and do an Article 220 load calculation on this building. Only then will you be able to determine the correct MINIMUM service size. Once you establish the minimum, then you can inteligently discuss what should be allowed for future use. You seem to want to avoid doing the calculation. There is nothing in the code about a VA per square foot value that should be adhered to except in the optional calculations for schools. There are too many variables for a VA per square foot number to have any meeting. It is like trying to price per square foot, can you apply the same price per square foot for a cathdral that you would use for a warehouse? How is the building heated and/or cooled? How many sign circuits will be installed? Are there "show windows?". Is the lighting installed to the minimum VA reguired in article 220 or has this been exceeded? Will there be motor loads? Stop looking for shortcuts or for someone else to give you the answer. Do the calculation, if you cannot perform the calculation find someone in your company that can. Anyone with a Master Electrician License will have had to perform a calculation in order to qualify for the license in most jurisdictions. If there is no person in your company that can perform an article 220 calculation then you will have no choice but to accept the engineer's recomendation. Trying to figure this any other way does not make sense. If you think the people on this forum have been rough on you, wait until you tell the engineer that you think his service is incorrect without having anything to back it up other than a VA per square foot figure and your hunch that it is too much!