Just pulling something from the internet (don't trust everything you see so take this with a grain of salt I'm not a lawyer): "If the building in question isn't officially designated as an SRO or hotel, it is illegal for landlords to rent individual rooms to tenants for a number of reasons, including that it could allow landlords to evade the maximum rent permitted by the Rent Stabilization Law and Code."

The big issue here is that the legality of the receipt of out-of state referral fees is entirely permissable if you are licensed in Florida and your license is active with the DBPR and if the Principal is fully aware of the arrangement to pay you a fee this is the important part.

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Most important in both cases is having an LTV of 80 or better, a good fico score, and a DSCR of 1.00+

Wow that's an incredibly important nuance, thank you for raising that.

Who will address tenant nonpayment issues, including evictions?

When you lose that lawsuit, the court will issue a judgment against each and every partner for the full amount of the damages (which can also include court costs and post-judgment interest and depending on the terms of your loan agreement, maybe even the lender's attorney's fees for the suit). 

If you're operating an STR out of an ADU (includes basement ADUs) you can only STR up to 120 days/year.

Don't get me wrong, some of those are important in moderation.  

Another important factor here is your deal flow.