Kuper Sotheby's International Realty | 3,066 followers on LinkedIn. Kuper Realty Corporation was founded in 1972 by Charles Kuper, Jr. and his family as a commercial brokerage firm. In 1978, Kathleen Kuper expanded the company to include a service oriented residential real estate brokerage arm specializing in the upscale market. In 1979, its operations were expanded once again to include farm and ranch brokerage and relocation services.