Airbnb is in heavy flux currently, it'll be a few years before they work out a workable agreement.

But in terms of "how" the savings actually occur (which seems to be part of your contention), everyone says that, for example, if you won $130,000 in the lottery and dumped it on the mortgage January 2023, the resulting $105,308 in interest savings basically comes two places:The last 30 months after your lottery payment where you still pay interest, but it's a lower amount and, The last 23 years and 5 months of the 30 year term (the time that you no longer have to pay your mortgage) The problem is, I can never get the math to work out, so here's what I come up with and you tell me where it's wrong.I get an average interest payment over that time of $273.XX and multiply it by 281 months (23 years and 5 months) for the bulk of the savings - $76,715.The remaining 30 months you are still paying are at an average of $43.56/month of interest for a total of $1306.95 interest that you have to pay on your last couple years.From Feb 2023 to July 2025 you WOULD HAVE paid an average of $559/month for 30 months which equals $16,770. 

Work out an agreement with a buyer.4.Pay a realtor, investor, or Re Attorney to help with the sales contract. ( buyer will pay for closing cost if contract is written correctly, it is part of the owner finance fee to the buyer.)5.Have title company or Re Attorney do your closing.

Then, regroup in the New Year and decide what to do if it doesn't work out. 

I would be hiring subs for certain thing to expedite the project.I don't mind hooking up with somebody on the first project to get started. that's what I'm researching now. with the right person partnerships work out really well.How did you get started in Florida you mind me asking?

Figure your rehab into your costs, but take a look at the numbers,i don't know why you are paying the same in insurance for each building, see if you can get them under one policy. there is even more money to be made there, fight your taxes, but look at the garbage costs as well, it is costing you more per unit for the 9 unit than the 4 unit to remove trash, work out a better deal with the trash hauler.

Once you know how much you'd be willing to pay as an investor, and you know how much you want to make for your own profit, you can work out what any property is worth to you as a wholesaler.After you get used to wholesale valuation, the rest is pure marketing and sales.

It sounds like personal issues that they need to work out and there's no need for you to get involved as long as they are paying the rent, abiding by the lease, and not doing any damage to your property.

But if things don't work out, get rid of them all, and spread the reasons around the neighborhood as well.

It can be a bit overwhelming at first, but it will work out if you do not give up. good luck