For example, they purchase a warranty for their property that covers common repairs with a $50 deductible.

I think somewhere around 1 months rent is common. 

I would advise you to consult your tax professional as we do not know your individual tax situation, nor what caused your initial interest in QOFs.To answer your question sincerely (with a common answer in the tax and accounting world), "it depends".

That is the common legal definition, all depends on your language and model waterfall. 

While they’re not common you do want to know if your contract has one.

If you and/or friends have other assets, you might want your LLC to partner with their LLCs in the common asset holding LLC for the full protection. 

In my area garbage and sewer would be the 2 most common.

I see fewer and fewer of these now, but they were more common a couple of years ago. 

I'm not an expert on Florida at all, but I know STR is super common there and can be very lucrative if done correctly.

For example, I found a home in an ok neighborhood that cash flows at 300 dollars a month with an ROI of 30%; however, would slight foundation issues (which are really common in my area on 99% of housing here) scare you away?