Swiss Prime Site was founded in 1999 and is the largest listed real estate group in Switzerland. SPS has continuously expanded its portfolio through acquisitions, developments and conversions as well as a strong focus on prime locations. The acquisition of Jelmoli (2009) doubled the value of the real estate holdings. The most significant acquisitions to date include the purchase of Maag Holding (2004) with the Maag site in Zurich West, where the Prime Tower and surrounding buildings were constructed. Together with Swiss Prime Site Solutions (real estate asset management for third parties), SPS manages real estate assets of around CHF 21 billion.