A contract consists of a legally binding agreement or promise between parties. Here's a quick reference guide for how to fill out the residential contract of sale.This video provides a step-by-step guide on how to fill out Maryland's Residential Contract of Sale form. A Maryland residential purchase agreement is a contract that binds a buyer and a seller for the sale and transfer of real estate. Seller has the right to continue to offer the Property for sale and to accept any other offer at any time prior to notification of acceptance. Edit, sign, and share maryland real estate contract online. No need to install software, just go to DocHub, and sign up instantly and for free.