The Redbrick LMD-Gragg Cardona team will oversee the redevlopment of St. Elizabeths East. (Bill O'Leary/The Washington Post)

Outgoing District Mayor Vincent C. Gray has tapped a development team to lead the first phase of the transformation of the city’s St. Elizabeths East Campus into a sprawling urban community.

A joint venture between Redbrick LMD and Gragg Cardona Partners has been selected to redevelop roughly 1.6 million square feet of land in one of the poorest sections of the nation’s capital, the mayor’s office announced Monday. Officials expect the project to remake what was once a massive hospital complex into “a technology-focused, transit-oriented community” featuring a mix of retail, residential and commercial office space.

Last year, the city opened the Gateway DC Pavilion, featuring a park and space for vendors, as well as a meeting and innovation center on the East Campus, which Gray said laid “the groundwork for what is possible on this historic campus.”

Now, “by selecting a master developer, we can move even closer to realizing that vision and creating an innovative space that’s unlike any other in the District of Columbia,” the mayor added in a statement. The selection marks one of Gray’s last acts as mayor.

The Redbrick LMD-Gragg Cardona proposal calls for 1.1 million square feet of residential space, 716,000 square feet of commercial space and 122,000 square feet of retail. Additionally, nearly a half million square feet will be reserved for so-called innovation purposes. Earlier this year, Microsoft outlined plans for an innovation center at the site, where the company would provide software training for students and entrepreneurs.

Redbrick LMD and Gragg Cardona, both headquartered in the District, were chosen “based on their experience with large-scale projects” and their plans to help meet the administration’s policy goals, city officials said. The development team will also include home-building firm NVR, JBG Rosenfeld Retail and Perkins Eastman.

The group has said that the project would create 9,000 new jobs for the District, half of which would be construction-related, while the other 4,500 will be permanent positions once the project is completed.

In response to questions from the public earlier this year, the Redbrick LMD-Gragg Cardona team said it was “committed to offering equitable opportunities for local Ward 8 businesses to participate in the development process and become tenants in the retail, office and community spaces across the campus.”

“Partnering with the community is important to the success of the new St. Elizabeths, so our door is always open,” the group added.