@Neil G. - I will come at it from a different perspective. As a contractor/house flipper myself, none of the things you mentioned that need to be repaired are THAT big of an issue and are typically things I find in all of the houses I come across. This just feels more painful because there are more ACs, more water heaters, etc.
Have you already spoken with the different trades to get actual estimates for repairs or are those just your estimates? The good news with having multiple repairs of the same type, you can ask for a discount for multiple jobs. I know with each of my trades, I would be asking the plumber and the AC guy and the mold remediation guy for a discount for them to do multiple repairs at the same location.
I don't think being all in on each unit for $130k is a bad scenario if you can separate the units and sell them separately, or even get them all repaired and cash-flowing and then hold it or sell it off as a turnkey property to someone else.
Am I understanding correctly that your ideal plan A scenario is to hold the property, and then the fallback plan B option would be to possibly resell the units 1 by 1?
If you want to chat in more detail feel free to PM me, I would curious what area you are in when you say "Tampa area".