acquired Ancestry.com. In 2012, Blackstone acquired a controlling interest in Utah-based Vivint, Inc., a home automation, security, and energy company. Real estate Blackstone's most notable real estate investments have included EQ Office, Hilton Worldwide, Trizec Properties, Center Parcs UK, La Quinta Inns & Suites, Motel 6, Wyndham Worldwide, Southern Cross Healthcare and Vicinity Centres. The purchase and subsequent IPO of Southern Cross led to controversy in the UK. Part of the purchase involved splitting the business into a property company, NHP, and a nursing home business, which Blackstone claimed would become "the leading company in the elderly care market". In May 2011, Southern Cross, now independent, was almost bankrupt, jeopardizing 31,000 elderly residents in 750 care homes. It denied blame, although Blackstone was widely accused in the media for selling on the company with an unsustainable business model and crippled with an impossible sale and leaseback strategy. After the 2007–2010 subprime mortgage crisis in the United States, Blackstone Group LP bought more than $5.5 billion worth of single-family homes to rent, and then be sold when the prices rise. In 2014, Blackstone sold Northern California office buildings for $3.5 billion. The buildings sold in San Francisco and Silicon Valley included 26 office buildings and two development parcels. In 2018, a critique was raised regarding a purchase agreement on several hundred apartments in Frederiksberg, Denmark, between Blackstone's Danish partner North 360 and Frederiksberg Boligfond, a non-profit housing organization established by Frederiksberg Municipality in 1930. After a resistance of residents and questions regarding the legality of the purchase agreement, Blackstone withdrew from it in October 2019. On December 1, 2022, Blackstone Inc. restricted withdrawals from its $125 billion real estate investment fund BRIET due to a surge in redemption requests from investors. The move caused investor consternation and limited the ability to attract new capital for BRIET. Marketable alternative asset management In 1990, Blackstone created a fund of hedge funds business to manage internal assets for Blackstone and its senior managers. This business evolved into Blackstone's marketable alternative asset management segment, which was opened to institutional investors. Among the investments included in this segment are funds of hedge funds, mezzanine funds, senior debt vehicles, proprietary hedge funds and closed-end mutual funds. In March 2008, Blackstone acquired GSO Capital Partners, a credit-oriented alternative asset manager, for $620 million in cash and stock and up to $310 million through an earnout over the next