YIT Oyj engages in the real estate business. It operates through the following segments: Housing Finland and Central and Eastern European Countries (CEE); Housing Russia; Business Premises; Infrastructure Projects; Paving; Partnership Properties; and Other Items. The Housing Finland and CEE segment constructs and develops apartments and entire residential areas. The Housing Russia includes construction and development operations in Russia. The Business Premises segment consists of business premises construction, project development, and commercial property and facilities management businesses. The Paving segment deals with paving and mineral aggregate production as well as stabilization, milling, and waterproofing. The Partnership Properties segment includes income derived from investments and increased value of the assets. The Other Items segment refers to group internal services, rental revenue from external customers, and group level unallocated costs. The company was founded in 1912 and is headquartered in Helsinki, Finland.