LEGAL NEEDS, YOU SHOULD CONSULT A NORTH CAROLINA REAL ESTATE ATTORNEY BEFORE YOU SIGN IT. This offer shall become a binding contract on the Effective Date. A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price.How to fill out the Offer to Purchase and Contract North Carolina? 1. Fill in the property address and legal description. 2. INTRODUCTION: These guidelines are provided to assist Brokers and attorneys who are completing the Offer to Purchase and Contract—.