The void was filled by a reputable foundation repair company and passed inspection.

I will say we have yet to view either properties in person so that will likely answer most of our questions barring a final inspection. 

Also, make sure you have a home inspection as there are different levels of new construction. 

When the city inspected it, they mainly checked for proper ventilation.

Inspection?

I specialize in the Property Management Industry in the Phoenix area and the way we write the lease agreements, handle yearly property inspections before allowing tenants to renew, have a deferred maintenance program to help keep the property in great condition, and get you the highest rents possible with the lowest vacancy times, it can make the process very easy and all you need to do is sit back and enjoy the cash flow.

When I asked him when is best for him for a house inspection, he will be traveling (his family is still home), and suggested we do it after he comes back in 3-4 weeks.

And closing costs of $4,200 work out to 1.2%, which seems low for attorney's fees, appraisal, inspection fees, pre-paid homeowner's insurance, origination fees, pest inspection, pre-paid property tax, recording fees, survey fees, title fees, transfer taxes, etc.Not sure how old the property is, but CapEx + Maintenance of 14% feels optimistic to me. 

I'm guessing this is a conventional buy, so make sure you have and use your inspection contingency to check for it being an approved triplex, and make sure you have your financing contingency in case the appraisal comes in low.

I've had some plumbing issues and am looking at buying a cheap, $100 camera on Amazon (example: https://www.amazon.com/Industrial-Endoscope-Oiiwak-Inspection-Waterproof/dp/B081J3LN61/ref=mp_s_a_1_8?