A letter agreement is a written legal document that is made between two parties who want a simple way to make their discussions of a transaction official. A letter of agreement is an agreement between two parties that puts the terms of the agreement in writing as a means of resolving later disputes that may arise.THIS CONSENT AGREEMENT (the "Agreement") is made as of the _____ day of ______. Create a Letter of Agreement (LOA) using our free DIY printable template. Remind someone of their legal duties to you before initiating legal proceedings. A purchase agreement letter between seller and buyer is created when two parties come together, where one party desires to purchase a piece of property. A Letter of Agreement is a document that outlines the terms and conditions of an agreement between two parties, like a more concise version of a contract. It offers a simple and efficient way for all involved parties to know their roles. Drafting an agreement letter can help you document negotiations or establish working relations between two or more parties. In general, in a manager-managed LLC that has no operating agreement, each manager.