The state gaming commission voted 3-2 on Thursday to offer the slots parlor license, with conditions, to Penn National Gaming, which plans to operate the facility at the Plainridge harness racetrack.
A proposal by Cordish Cos. in Leominster won two votes, including from commission chair Stephen Crosby. The third applicant, Raynham Park, did not receive any votes.
Commissioners who backed Plainville cited, among other factors, the preservation of harness racing in Massachusetts.
The license is the first for expanded gambling in Massachusetts since passage of a law allowing for three destination resort casinos and a single slots parlor.
The smaller facility can offer up to 1,250 slot machines, but no table games.
Plainridge is about 20 minutes from Rhode Island's Twin River Casino in Lincoln. Twin River Chairman John E. Taylor Jr. said in a statement that Twin River has successfully competed against Connecticut's two casinos, Mohegan Sun and Foxwoods.
"To that end, we remain confident that our convenient highway location, strong partnership with the State of Rhode Island, full range of amenities and attention to customer service will continue to well position us against new venues in Massachusetts," Taylor said.
The Boston Globe reported that Penn National has until 9:30 a.m. Friday to accept the conditions of the license.
NBC 10 News contributed to this report.