Foundation issues can cause all kinds of problems

I would have written a 5 figure check to avoid all the headaches it caused me and my staff. 

But once its sold, its certainly not making you any more money.You'll get a more favorable rate by doing a reduced leverage refinance, but almost every lender will put some kind of a prepayment penalty on there (usually ranging 3-5 years), so you won't be able to really "pull" from the equity consistently without incurring some financial implications, so it really does depend on what you are looking to do next.

I would check and research the seasonality for the area.

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Yes, absolutely do a background check.

Check Crexi and Loopnet as a start.

I walk by your house all the time and just wanted to check in with you to see if you have thought about selling now or any time in the future.

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Run your numbers and check.