lease. The Public Authorities Control Board, which effectively ended the West Side Stadium plan, approved the state financing of the Atlantic Yards plan in December 2006. Barclays Center The Barclays Center is the home arena of the National Basketball Association's Brooklyn Nets which was purchased by a group led by principal developer Bruce Ratner with the intention of making it and the arena the centerpiece of the whole project. This brought major league professional sports to Brooklyn for the first time since the Brooklyn Dodgers moved to Los Angeles, California after the 1957 season. The arena’s design once included an ice skating rink and a green roof. The Nets, by that time owned primarily by Russia's second richest man Mikhail Prokhorov, began playing at the Barclays Center arena in 2012. Formerly the New Jersey Nets, the Nets re-branded themselves when they moved to the Barclays Center. Prokhorov, with 80 percent ownership in the Nets at that time, he became the first Russian owner of a major U.S. professional sports franchise. The deal was necessary for Ratner, who was risking losing tax-exempt financing and the Barclays naming-rights deal if he did not break ground within three months' time. On September 18, 2019, Joseph Tsai, the executive vice chairman of the Alibaba Group, completed the acquisition of full ownership of the Brooklyn Nets and Barclays Center. With the closing of the transaction, Tsai became NBA Governor of the Nets and its affiliates. Zoning Ground was broken on the first residential building at Pacific Park—B2—on December 18, 2012. The building will have 363 units, 50% of those units will be "affordable." In March 2011, The New York Times revealed that Forest City Ratner was considering building a 34-story apartment building out of prefabricated units, making it the largest prefabricated structure in the world. The move is likely to save considerable building costs, because construction in a factory is cheaper than at a field site. While satisfying affordable housing advocates, it is likely to anger construction unions, who have been major supporters of the project. At 32 storeys tall, B2 will be the tallest building in the world constructed using modular technology. The housing component of the project has been criticized for its urban density. The construction of a 34-story prefabricated building, while not the first prefab high-rise in the city, would be the largest. However, B2 will be completed in late 2015 —