NASHVILLE, Tenn. (AP) _ Leaders of Nashville's convention center already are mapping out a possible future expansion of a center that spans six downtown blocks and sits on 19 acres.

The Tennessean reports the project leaders of Nashville's Music City Center are identifying which adjoining lots would best accommodate an add-on, in case the center is so successful that it isn't big enough.

As part of a master plan, planners have identified five options where future expansion could feasibly work.

Those include the city's Bridgestone Arena land, three private properties and the preferred option _ building atop the existing center.

The exhibit hall, ballrooms and meeting rooms at Music City Center total 1.2 million square feet. Its overall square footage is 2.1 million, placing it somewhere in the 20s among convention centers nationwide.