This is not perfect as you will not know if a owner has some dates blocked for personal use vs being rented.

Short term the properties stay in mint condition virtually all the time, the maintenance is half of that in long term (biggest surprise to me), all of the legal headaches of long term are gone ( no evictions, bad checks, collections, security deposit disputes, etc.).Nobody making meth in the bathtub, no tenant not cutting the grass, no cars on blocks in the front yard, etc.

The location is decent , a block to the left is a nice neighborhood , a block to the right , not as nice.

Lots of unexpected road blocks with every flip that you likely won't be prepared for until you come across them.

If you get yourself a SFH w/ a finished basement (with a separate entrance), you can block of the connection point and you've got yourself a noncomplying duplex. 

This would be me and my business partners first flip, we got the home for a great price, however, it’s cinder block construction which we know nothing about.

Block doors, harass the sheriff, burn the police station, courthouse, whatever.

And it was built of concrete block walls, so maybe any other type of remodeling would have been cost prohibitive.Of course I felt there was no opportunity for value-add - the rents were as high as they could be for the units, all considering.

., Well your plan is doable but there's some road blocks you'll want to watch out for. 

I know there are great blocks and streets but don't know them.