I've had some blue collar ones all the way up to software engineers and everything in between. 

First - I think your accountant should be providing you recommendations for cost segregation companies.It it most likely, if he/she works with real estate investors, that he/she would have a couple to recommend.Second - There are two types of cost segregation studies.Type 1 - Conducted by an engineering firm where an engineer will inspect the property.

Does a tech firm really need to pay a CA located cpu engineer $300kyr when have national reach of hundreds/thousands equally qualified happy to do it for $200k....... 

I've worked with a client in a very similar situation, and have spoken to many inspectors/engineers/builders, etc about things like this.

At time of purchase I had a couple of engineers over to look at a couple of things.

For foreclosures, you reverse engineer.

The algorithm is properly ignoring your listing now.

Reverse engineering. 

Yesterday I was talking to and architect and engineer who is owed money.  

I have moonlighted for several Architects and through hard work and good fortune stumbled on an opportunity to become an apprentice electrical engineer. 10 years later I am a senior engineer, together with my wife, have a decent portfolio of Real Estate.