I'm a realtor in Fort Collins that specializes in helping For Sale By Owners. This FSBO paperwork is needed as soon as you accept an offer, so it's useful to have a purchase agreement onhand that you can fill out quickly.For your convenience we have provided a list of the most frequently used forms for residential real estate transactions. Some examples of documents you may need to sell your home are: Property survey: This is a legal document that shows the buyer the boundaries of your property. Colorado requires those selling FSBO to fill out and file many documents and forms. Several of these documents are legally binding agreements.