Cleveland Casino, opened in May 2012. In 2013, Rock Ventures, the umbrella entity for Gilbert's investments and real estate holdings, announced it had formed Athens Acquisition LLC, an affiliate of Rock Gaming, and acquired the majority interest in Greektown Superholdings Inc., owner of the Greektown Casino-Hotel located in downtown Detroit. In late 2018, Gilbert bought the online dictionaries, Dictionary.com and Thesaurus.com. In November 2017, former professional Call of Duty player and 100 Thieves CEO Matthew "Nadeshot" Haag announced that Gilbert had made a multimillion-dollar investment into the esports organization. Detroit initiatives Quicken Loans moved its headquarters and 1,700 of its employees to downtown Detroit in August 2010, where Gilbert and the company are helping lead a revitalization of Detroit's urban core. Gilbert's Bedrock Detroit has purchased several buildings in downtown Detroit, including the historic Madison Theatre Building, Chase Tower, Two Detroit Center, Dime Building, the First National Building the David Stott Building and the former Federal Reserve Bank of Chicago Detroit Branch Building. Bedrock Detroit has also purchased several buildings on the city's Woodward Avenue, including One Woodward Avenue and the 1001 Woodward office tower. In September 2013, Gilbert was named co-chair of the Blight Removal Task Force. The group published a detailed plan in May 2014 to remove all blighted structures and lots in the City of Detroit. In 2015, he purchased Book Tower in Detroit. A 2017 Politico Magazine article named Gilbert one of "America's 11 Most Interesting Mayors", listing him as though he were Mayor of Detroit due to his role in the city's development. In September 2017, Detroit Mayor Mike Duggan appointed Gilbert to lead a committee to make a bid for online retail giant Amazon to bring its second North American headquarters to Detroit. In 2018, Amazon narrowed its list of potential headquarters locations, removing Detroit from its list of contenders. Philanthropy and political donations In September 2012, Gilbert and his wife Jennifer joined The Giving Pledge, committing to give half of their wealth to philanthropy throughout their lifetimes. Gilbert's eldest son was born with neurofibromatosis. Gilbert established two neurofibromatosis research clinics at the Children's National Medical Center (CNMC) in Washington, D.C. and at the Dana Children's Hospital at the Sourasky Medical Center in Tel Aviv, Israel. Gilbert also serves on the boards of the Children's Tumor Foundation, the Cleveland Clinic, and the Children's Hospital Foundation (an affiliate of CNMC); and is the vice-chairman of