A master service agreement (MSA) is a fundamental contract outlining the scope of the relationship between two parties. A master lease agreement pertains to the leasing and subleasing of property, while a master service agreement pertains to the provision of services.A master lease agreement is a contractual arrangement between two parties, typically a property owner (lessor) and a tenant (lessee). A Master Service Agreement (or MSA) is an agreement between two parties that list the terms and conditions that will govern their future business relationship. Master Service Agreements are typically used to govern long-term business relationships, while a Statement of Work lays out the terms of a specific transaction. Please return the original via US Postal Service. Of the Master Leasing Agreement and any appropriately executed Product Schedules.