Eldorado operated 26 assets compared to Caesars, which controlled 53. In June 2019, Caesars accepted Eldorado's offer to purchase Caesars for $18 billion in stock and cash. In March 2019, it was reported that Eldorado was discussing a merger with Caesars Entertainment. In early 2019, Eldorado sold Presque Isle Downs and the operations of Lady Luck Casino Nemacolin to Churchill Downs, Inc. Additionally, Eldorado paid $246 million for the real estate underlying Tropicana's Lumière Place casino in Missouri. Gaming and Leisure Properties simultaneously purchased the real estate of five of the casinos and leased them to Eldorado for a total of $88 million per year. Two months later, Eldorado acquired the operating business of Tropicana Entertainment for $640 million, adding seven casinos to its portfolio. In August 2018, Eldorado bought the Grand Victoria Casino in Illinois for $328 million. In May 2017, Eldorado acquired Isle of Capri Casinos for $1.7 billion in cash, stock, and assumed debt, adding twelve casinos to its holdings. In November 2015, Eldorado bought Circus Circus Reno and the 50% stake in the Silver Legacy that it did not already own from MGM Resorts International for $73 million.

Eldorado's existing owners held 50.2 percent of the combined company, and Gary Carano was appointed as its chairman and CEO. The transaction closed on September 19, 2014, creating Eldorado Resorts Inc. The merger would add three racinos in Ohio, Pennsylvania, and West Virginia to Eldorado's portfolio. In 2013, Eldorado agreed to combine with the publicly traded MTR Gaming Group in a reverse merger. It was then rebranded as the Eldorado Casino Shreveport. In 2005, the company took over the bankrupt Hollywood Casino Shreveport in Louisiana, buying a 76 percent stake in the property for $154 million. The Eldorado companies were reorganized in 1996 as Eldorado Resorts LLC in connection with a $100-million bond offering. On July 28, 1995, the Eldorado opened the adjacent Silver Legacy Resort Casino in partnership with Circus Circus Enterprises.

The company traces its history back to the development of the Eldorado Hotel in Reno, which was opened on May 24, 1973, by a group of investors that included Don Carano and other members of the Carano family.

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