Contact numerous lenders, prepare financial paperwork, and acquire a mortgage pre-approval letter.

I wouldn't really worry about it as long as there isn't a balloon.

Do you ask the guests for their assignment letters?

The tenants sent me certified letters threating to sue me because of air conditioning problems that I had approved to fix but Renters Warehouse did not work/communicate well with the warranty company.

He sees some of his customers starting to sale properties due to the 3 and 5 year balloons coming due in the next 1 to 3 years. 

Ask your attorney if It may be worth sending them a letter indicating they should open a claim with their Professional Liability Insurance carrier. 

If you invested in Phoenix or Tucson, you could drive over and deal with it.At this point, I would  have an attorney in the county the properties are in send a demand letter.

But if you use a letter of Intent or a contract with plenty of exits for your purchase this can be a huge benefit for you. 

You should still instruct title company to run a title and lien search.Also did you receive a payoff letter to see how much is still owed?

I sent a letter saying that the lease ends in Aug and I do not wish to renew.