That is too high and after "reverse engineering" the calculations.

They've probably been burned before. 

I'm a retired engineer and have been successfully using income from these houses to support my retirement without dipping into retirement savings.I'm transitioning my business from rentals to a franchise and would consider selling one of my houses (5 br/4 ba - the other houses my son while he's still attending).

.: I'm taking a break from buying and my previous approach of analyzing deals in inexpensive markets, looking at hundreds of properties on Zillow and running the numbers, which I spent hours each on each day and became really burned out.

I would reverse engineer the ideal property by looking at your market and seeing what the market needs.

After 20+ years in real estate partnerships, here's what actually puts you on the IRS radar (and what doesn't):REAL Red Flags That Matter:The Partner Complaint TriggerDisgruntled partner files Form 8082K-1 disputesPartnership disputes leading to tax filingsReal Impact: Instant IRS attentionSuspicious Loss ClaimsLosses exceeding investmentArtificial basis inflationSudden large losses without economic realityExample: $100K investment claiming $500K lossesRelated Party GamesCircular property flipsBelow-market transfersFamily partnership schemes without substanceWatch Out: IRC §267 and §707(b) violationsDebt Engineering Red FlagsBasis inflation schemesArtificial guarantee arrangementsPartner debt shifts near year-endCritical: IRC §752 compliance matters!

I finished all the degree requirements only to discover I was extremely burned out and had to complete another year of electives to satisfy a minimum number of credits at that university.

I found it to be a great vehicle while I was working a W2 job as an engineer.  

So shift your expectations to most of the cash out and you'll be good and you'll actually start buying deals, versus people who wait for the perfect deal, spin their wheels for 6 months terminating contracts/analyzing hundreds of places, and then eventually burn out and give up. 

Work with your attorney for what is needed to insure all subcontractors get paid by the General Contractor.Make sure the insurance covers Construction period and also materials.Talk with your Commerical insurance agent and they should address the above questions with you.If this is an older facility make sure your engineering firm has covered Fire Suppression systems and any Storm pond or drainage systems.