He has books/magazines full of plans. mostly Mediterranean style, but others as well.The two we used have 6" wall so either concrete block or 2x6 frames which is costly but great insulation.The two also were for slab construction like many FL homes. 

The affordability problem is getting worse and worse, and society's shift to the right in the last 24 months makes it seem like that policy change is more likely to come in the form of supply side subsidies than rent control style policies.  

Hoping theres something out there that has an All in One style and not as expensive as the leading Accounting softwares out there now (quickbooks, freshbooks, xero, etc) - If any of these are your suggestions, then please let me know why, so I can make an honest decision if I truly want to spend that type of money down the road.Tracking accounts payable/receivables, generating proposal/invoices that can be electronically signed, approved and immediately returned to me.

My main concerns are demand for “duplex style” (will this be always 2nd rate demand due to the connectedness?)

The area that I live in is more of a long term appreciation style of investing since the price of houses vs the rent you can receive isn't that great.

Specifically for SFH and MFH that fit the more BRRRR styled model. 

If your tenant is leaving soon and you’re just looking to replace them with a new tenant, and you really can’t wait for them to leave before starting to show the unit, then I would coordinate a few time windows with the tenant when you can host open house-style showings.

The material price is very low since its out of style, but its clean and will last for decades in a bathroom and kitchen.

There are so many different styles and techniques to investing in real estate, and they all work.

Your part of the deal is to manage the rental and ensure your parents maintain their bill free life style.