The Georgia World Congress Center Authority has released updated renderings of proposed changes for Centennial Olympic Park in downtown Atlanta.

The 21-acre greenspace is considering adding new water features, a bike depot to rent bicycles, a new building near the Georgia Aquarium for events and expansion of the Southern Company Amphitheater across from CNN Center.

There will be a new torch sculpture, a gold, silver, bronze podium, a court where visitors can play large-scale games and Olympic rings at the entrance to the park off Centennial Olympic Boulevard.

The changes are part of a $25 million update of the park — the original site of Atlanta's 1996 Summer Olympics — that will include demolishing the former Metro Atlanta Chamber building to open up the site to Marietta Street.

The state-operated GWCCA, which owns the park, has raised millions in donations from corporations such as AT&T, Coca-Cola, Bank of America and Cox Enterprises, parent company of The Atlanta Journal-Constitution. The Woodruff Foundation donated $10 million to the effort in 2015.

Plans call for new terraced seating along Park Avenue West and the extension of the existing water features to make the northern end of the park more inviting. A multi-level indoor building will create views of the park and provide event space that the GWCCA can rent.