Weingarten Realty, the buyer of Atlanta’s civic center, has produced renderings of its $300 million mixed-use development.

The renderings, presented to Invest Atlanta, show design concepts for the 20-acre property a Weingarten executive said Wednesday is “still evolving.”

The Atlanta Journal-Constitution first reported in September that Weingarten was in final negotiations to acquire the site for $30 million. The Houston-based developers plans, as outlined last month to Invest Atlanta at the time, call for more than 380 apartments, 20 townhouses, nearly a quarter-million square feet each of office and retail space, a grocer and 250 condominiums. The Boisfeuillet Jones Atlanta Civic Center will be razed as part of the redevelopment.

Bill Coats, Weingarten regional development director in metro Atlanta, said Wednesday that pieces of the development have shifted locations from the initial renderings and a more detailed site plan is expected in the coming weeks. The updated site plans could include different configurations of the buildings and additional office space.

A park with events space remains central to the project.

“The site plans are evolving,” Coats said. “The green space/park area is central to our plan and will be in the center of the project.”

Atlanta Mayor Kasim Reed and other local leaders have said redevelopment of money-losing city properties such as the civic center and Underground Atlanta, which is under contract to a South Carolina developer, will contribute to the revitalization of downtown. City Hall has sought to sell financially under-performing properties to free up cash without a tax increase to pay the debt service on a $250 million infrastructure bond program, which voters approved earlier this year.