MGM Resorts International has hired New York-based architecture firm Gensler to design its proposed hotel-casino in Massachusetts, as the Las Vegas-based company tries to gain favor with officials charged with approving three casinos in the state.

Gensler, whose work ranges from MGM’s CityCenter project in Las Vegas to San Francisco International Airport’s Terminal 2, is being brought in for what MGM says is the firm’s commitment to environmentally sustainable design.

The project, dubbed Rolling Hills Resort, is being proposed for a 150-acre site in Brimfield, which is about 65 miles west of Boston and about 25 miles east of Springfield.

MGM earlier this month said that it reached an agreement to acquire the property for a price it didn’t disclose.

Massachusetts last November said it will grant one license each for projects in the western, eastern and southern part of the state.

Massachusetts is requiring the developers to pay $85 million for each license and says that each project will require at least a $500 million investment.

The state will get 25% of the gross gaming revenue from each project.

Last week, Ameristar Casinos said it paid $16 million for a 41-acre site in Springfield that once served as a Westinghouse factory. That site, if approved by the commonwealth, will be developed into a casino as well as a luxury hotel, Ameristar said in a statement.

Hard Rock International said in November that it was looking to develop a 100-acre site in Holyoke, about eight miles north of Springfield, into a hotel-casino.

Follow Danny King on Twitter @dktravelweekly.

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