Just send them an email or text stating the lease is canceled because they failed to pay the deposit within 24 hours.

As for 'everything must be done through the LLC' - your property insurance must be covering the LLC (not you personally), your bank accounts that you receive rent and pay bills out of must be in the name of the LLC, your utilities must all be in the LLC name and not your own, etc.

I was wondering if I am in this situation again, can I pay cash (I have the liquidity) and then refinance after closing?

Getting in early (like before February 15th for personals  and in January for business returns) seems to be the secret the best I can tell.You get an automatic 4 month extension - but if you did not pay all the taxes owed (within 10% of what you owed by the filing deadline) you  will incur a penalty for that… and if they aren’t filed by the extension date that would be another one as well. 

- Is it possible to avoid paying taxes if we just re-invest all the money to pay down the principal on the new mortgage (residential)?

Paying down both will accelerate pay off for both to be in line for my retirement timing.

This can help pay for the mortgage.

There are also a lot of problems with this model that make it dangerous or possibly illegal.Third, BP is full of free information and you shouldn't need to pay for a course when all the information is available for free or in a few books.1.

If the double needs updating and you are handy, you can force appreciate the unit you are living in while paying no or almost no money for the home as your renter covers most of your expenses.By the time you are done renovating + 3-5 years give or take you have a forced appreciated property. 

Bad news is you still have to pay them to run it for you.Hope that helps navigate the seas on a surface level for your NOLA STR!