Members of the Prince George’s County District Council, which decides land use and zoning matters, expressed support for the plan as a major economic development engine. The casino, which will be designed to hold 3,600 slot machines and 140 table games such as blackjack, could open as early as July 2016. Prince George’s County officials on Monday approved a building plan for a $925 million MGM Resorts International casino and hotel near the nation’s capital on an 8-1 vote, paving the way for MGM to get the permits needed to begin construction. An artist's rendering shows the resort being planned by MGM Resorts International on property alongside Interstate 495 and overlooking the Potomac River outside Washington DC.