Otherwise prepare to cry and wonder if your money is being stolen.  

If you day-trade or read the tea leaves for hot stock tips or play the ponies or simply put your money in index funds, do any of these things occupy your interest like real estate?

If a toilet runs at full pressure, the tenant is going to call you sooner than later from the sheer racket it's making.If you are purely looking for leaks, you will spend significant sums of money to save yourself very little money in the long run. 

Do I need to show that money (25%) in my business account for two months?

An in ground oil tank for instance can be a considerable liability. 

In my opinion STR and small hotels are where the money is made in Spain. 

I have enough money in my 401K to pay off the Rental.

@Corey SchneiderWe fund with a combination of Hard Money and Private Money. 

Who pays the earnest money to the title company?

You don’t need to do a 1031 because you’re going to lose money on the sale.