3) Anyone have any references for a reputable hvac contractor in chicago that installs high velocity systems such as those mentioned above? 

I would hope that a competent general inspector would at least know enough about each component of the house, that they could refer you to a specialist (roof, foundation, etc) if they deemed it necessary.Where I'd supplement the generalist with the specialist is when the former said they were genuinely unsure about the condition of a specific component which required a specialist's knowledge to assess. 

When you refer to the closing cost would that be 5%-6% of total purchase price?

I've dug very deeply into this in Massachusetts and according to the State Board of Registration in Real Estate, you cannot engage in wholesaling (assigning contracts) unless you actually own the property - and that's more often referred to as "wholetailing". 

I’ve thought about googling GCs and offering them a small incentive ($50-$100) to offer me a ballpark figure that I’d be able to reference once I send the properties to my buyers.

And are you referring to a lease option?

<==Now if anyone gets this reference you get extra points and a smile!

References of current investors can be supplied.Tim

@Joseph Hammel A landlord has no obligation to provide a reference at all.

Hi,My friend referred a contractor to me (who is her high school friend) and they are relative new but they have done a few new builds and additional, renovation. etc.