The largest Polish office leasing contract in 2013 was the app. 23,000 sqm of new offices taken up by mobile phone operator Plus in an office building under development on ul. Konstruktorska in Warsaw. The companies behind this coup were White Stone Development, and MF Capital, who together developed the head office of Polkomtel (the owner of Plus). One of the people responsible for this transaction is Jan Schwarz, the managing director of MF Capital. The building, with an area of 23,000 sqm, should be completed in August 2015.