Welcome to CENTURY 21 Master Key Realty’s website. Feel free to search our inventory and call our office at 419-586-2313 or any one of our friendly, qualified Realtors with any of your questions. Our Realtors work diligently to exceed the expectations of their clients in order to provide an unmatched level of service and peace of mind during the Real Estate Transaction. CENTURY 21 Master Key Realty is a full-service brokerage located at 909 North Main Street in Celina, specializing in Residential and Commercial properties.