Utilize the input text as a context reference, choose the right relationship between Realogy and Century 21 Real Estate from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Century 21 Real Estate LLC is a subsidiary of Realogy Holdings Corp. ( RLGY ), a global leader in real estate franchising and provider of real estate brokerage, relocation and settlement services.

Answer: subsidiary