Many people choose to entertain important corporate or personal occasions at restaurants in a relaxed atmosphere away from home to make the event a memorable one.
Alex Brennan-Martin, co-owner of Brennan’s of Houston, an establishment that draws 20% of its revenue from private events says, they cannot compete in the business only on price, but there are other important factors, ie:

Room service
Restaurateurs find it important to offer private rooms for special events, such as corporate dinner or an anniversary celebration. Generally, it is an exclusive space with a lounge area, a couple of couches, coffee tables and a stand-up bar.
According to Private Dining Director Daniela Ortiz of Naha in Chicago, and Jeanne Cretella, who owns Stone House at Stirling Ridge in Warren, and Liberty House Restaurant in Jersey City, N.J., are of same opinion that it is important to have room to relax, reserved in a way that will benefit the operation.