The owners and managers of the Suffolk Downs racetrack this morning unveiled plans for a $1 billion gambling resort on a 163-acre site in East Boston that will include a hotel, restaurants, casino gambling space, entertainment venues, a spa — and the racetrack.

The track officials said the project would include a 200,000-square-foot gambling space that would house 4,000 to 5,000 slot machines and 200 table games.