Sotheby's International Realty began in 1976 as a luxury real estate brand tied to Sotheby's auction heritage. The company operates a residential real estate brokerage and franchise network focused on marketing and brokering premium homes, supported by a global referral system and a broad international property platform. Its business spans luxury residential sales and specialty property marketing, including segments such as waterfront, golf, ski, farm and ranch, and historic homes. The brand serves buyers, sellers, and affiliated agents across numerous markets worldwide through a network built around local expertise and international exposure.