A California purchase agreement contains all the provisions, disclosures, and general information needed to secure a binding contract. Fillable forms cannot be submitted electronically, but must be printed and mailed.Please visit eLicensing for online submission options. In this tutorial I will explain how to use Google Forms effectively to get reviews from past clients as well as your SOI. Here are the 7 best For Sale By Owner websites in California: 1. Every residential purchase agreement in California needs to include: Seller and buyer personal info. Address of the property in question.