Gibson Sotheby’s International Realty is a privately held residential real estate brokerage firm specializing in residential sales, luxury properties, and relocation services throughout Massachusetts and select New England markets. The company was founded in 1962 in Boston by real estate broker Betty Gibson and has grown into one of the largest independently owned real estate firms based in Massachusetts. Gibson Sotheby’s International Realty operates as an affiliate of Sotheby’s International Realty, providing access to a global network of real estate offices and marketing platforms. The firm represents buyers and sellers across a wide range of property types, including single-family homes, condominiums, waterfront residences, and luxury estates. Its Plymouth office serves the South Shore and surrounding coastal communities, supporting residential transactions and local market representation. Gibson Sotheby’s International Realty maintains centralized leadership and regional office management while operating multiple branch offices across Eastern Massachusetts, New Hampshire, and Rhode Island. The company is privately held and does not trade on a public exchange.