As far as issues go, since you have been with these folks for sometime and these have been repeat problems, don't extend the lease going forward. 

We are hoping to continue networking and want to switch the location from time to time in hopes of extending our network of local investors. 

But we have learned a lot about reserves (banks may not extend loans on buildings without reserves), the value of being pre-approved for a loan, scrutinizing condo regulations carefully, and, especially, working with a realtor you can trust.For orderly thinking people like accountants, the entire real estate business can be rather tortuous and exasperating but fortunately for me my husband is in sales so he "gets" that side of the process so that I can concentrate on running the numbers. 

He will tear down a side shed that is connected to the house in order to extend the small kitchen (that storage shed was an eyesore as well), and he will put vinyl siding on the house.

Based on others I've watched being done, it shouldn't take more than 3 days with a helper, assuming nothing unusual.I decided to use Hardieplank that comes already painted with a extended warranty.

After signing both the bill of sale and Application for Statement of Ownership documents by both parties I will pay off the amount directly to the mortgage company while also requesting a Release of Lein.

Whether or not this protection is extended to someone with whom you already have a signed lease, I do not know.  

Under Florida law, the buyer can legally transfer his or her rights in the pending sale to an independent third party.Which means, the deal may go through with a buyer who is different from the one who signed the contract (the assignment provision in most standard contracts also contemplate whether or not the original buyer will be released from any liability under the contract).  

Also, the big picture being to not over extend yourself, live below your means, save money, and use that money to grow more money, are time tested, valuable life lessons.

If they need to move, make it easy for them to leave by releasing them from their lease obligations without penalty.