BY BRETT ZONGKER

Associated Press

WASHINGTON

--The Kennedy Center for the Performing Arts is planning its first major expansion since it opened in 1971 as a "living memorial" to President John F. Kennedy, with new features including pavilions to house rehearsal halls and classrooms, a memorial garden and a floating stage on the Potomac River.

The plans unveiled this week call for a $100 million addition that would create a more lively outdoor space for gatherings and performances, with a pedestrian bridge connecting the center to the river.

Architect Steven Holl drafted the initial concept and was hired from among several contenders to design the expansion.

New marble pavilions--made from the same Italian Carrara marble as the original building's walls--would rise from a new garden situated beside the center, and the pavilions would be connected underground. Most of the new facility, totaling about 60,000 square feet of usable space, would be buried below the surface to help preserve the silhouette of the center's primary building.

Officials plan to raise private funds to build the project. To kick off the capital campaign, Kennedy Center Chairman David Rubenstein is giving $50 million to fund half the cost.

The center aims to raise an additional $75 million to complete construction and establish a programming fund. Officials hope to open the new space in 2018.

Kennedy Center President Michael Kaiser said the new pavilions would have windows to allow visitors to look in on rehearsals of opera, theater or dance.

"We're giving a great improvement in public access to the Kennedy Center, to our art making," Kaiser said. "It's going to allow us to engage our audience in new and different ways."

The new space for rehearsals and education programs also is desperately needed as the center has grown since 1971, Kaiser said.

The center now includes a national arts education program and houses the Washington National Opera as a permanent affiliate.

In an interview, Holl said he is honored to work on a memorial to a president he saw inaugurated in 1961 and respected so much.

"The Kennedy Center is a living memorial. It's active, open to the public for performance, the arts, which he really believed in," Holl said.