Refer to the input text as context and select the correct relationship between 'Realogy' and 'Century 21 Real Estate' from the available options.
Options: owned by, original broadcaster, subsidiary, owner of

Housing Industry Town Halls and Educational Break Out Groups: Carmen Mercado, national director, strategic growth markets for Realogy Franchise Group and a NAHREP Past President; Juan Martinez, broker/owner, CENTURY 21 Martinez & Associates; Charlie Young, president & CEO, ERA Real Estate; Top Producer Panelists: Erika Villegas, ERA Mi Casa Real Estate, Chicago; and, Alicia Trevino, CENTURY 21 Alicia Trevino Realtors Uptown, Dallas; Oralia Herrera, CENTURY 21 T.K., Broker/Owner; Frank Malpica, director of products and platforms for ERA Real Estate; Sergio Soto, ERA Mi Casa Realtors; Joe Castillo, ERA Mi Casa Realtors; JJ Lopez, CENTURY 21 Realogy Masters; and, Alex Chapparo, director of multicultural and growth markets for Century 21 Real Estate LLC.
subsidiary