Mr. Pitt said he had been attached to New Orleans for more than a decade. “I’ve always had a fondness for this place — it’s like no other,” he said. “Seeing the frustration firsthand made me want to return the kindness this city has shown me.”

Image James Timberlake added cooling vines climbing up the side of his building. Credit... KieranTimberlake

Rather than bemoan the slow pace of redevelopment in the Ninth Ward, Mr. Pitt said he decided to address the problem directly by teaming with William McDonough, the green design expert; Graft, a Los Angeles architecture firm; and Cherokee, an investment firm based in Raleigh, N.C., that specializes in sustainable redevelopment. John Williams of New Orleans is the executive architect for the project.

“If you have this blank slate and this great technology out there, what better test than low-income housing?” Mr. Pitt said. “It’s got to work at all levels to really be viable.”

When Make It Right was announced at the meeting of the Clinton Global Initiative in September, Mr. Pitt pledged to match $5 million in contributions to the project, as did Steve Bing, the philanthropist. Nine other firms — all of whom donated their services — are involved, including Adjaye Associates; Billes Architecture; BNIM Architects; Constructs; Eskew & Dumez & Ripple; MVRDV; Pugh and Scarpa Architecture; Shigeru Ban Architects; and Trahan Architects. “We wanted to have a mixture of voices,” Mr. Pitt said.

Beyond serving a public need, Mr. Pitt — who has a longstanding interest in architecture — was eager to see what the designers came up with. “I was most curious about advancing the discussion further,” he said. “That was certainly one of the benefits of this exercise. There is no other reason to call on these great minds if you’re just going to shackle them.”