If you're buying it with cash, then they'll want to see a bank statement, or a letter from your bank or your investment banker saying you have $XXX funds. If you're going to get a mortgage, then you'll need to provide a pre-approval letter.
I would be happy to help you and work you through the process if you are not already working with a Realtor. I cover the North Port area.
Tammy Hayes, Realtor
Re/Max Palm Realty