I would like to put up several shop rentals 1500-2000 sq ft each for rent by plumbers, electricians, mechanics, etc...

If I feel that I need to make a quick offer with no contingencies to get it done, I may also bring a team member with me to inspect the mechanicals, electrical, etc just to be sure.

This not only makes the entire mechanics much more simplistic, but also gives investors much more assurance of performance as your interests are more aligned.

And the roofer and electrician that were used both filed mechanics liens, so he didn't even pay people.So, the moral of the story is to get really good estimates and don't miss anything.

It will also attach a human (you) to the stay even though it will feel a little mechanical when they arrive.

Perfect for a hobby mechanic or for toy storage.

Given this is a quad, I would have reserved 6% for CapEx (4 mechanicals and huge Sq Ft).

Re-trading is not too different than what investors do with 1-4 units after an inspection (you sign an offer stating AS-IS, so any negotiations is usually about the mechanicals, not paint or anything you could see during your inspection). 

And if you have lived in it for 2 out of the 5 years prior to sale you will get the first $250K ($500K if married) of profit from that allocation tax free.The actual mechanism is that you do a 1031 exchange on the property sale and take boot equal to the gain from your primary portion. 

For a buy and hold, I will gladly take a 1960s era house that has been completely redone mechanically (new wiring, HVAC, plumbing, etc.) vs a house built in 1995 in which everything will need to be replaced in the first few years (HVAC, roof, etc.)