Inspection advice for commercial condo

[Kyle Scholnick]

I am looking to purchase a commercial office condo. I would like to get an inspection to check for major issues relating to plumbing, hvac, floor, water heater, ceiling, etc. 

However, I am dubious about inspections as many inspectors seem like they don't care at all and all they do is turn the lights on and off, run the water, flush the toilet and then they want a check for $400. 

How do I find a good inspector to look at the major issues? 

Thanks