Andrew Altman may be the only person involved in the development of the District's waterfront who doesn't describe his departure as a big setback.

"I wouldn't leave if I thought that the sky was falling," Altman said of his decision to resign as chief executive of the Anacostia Waterfront Corp. "I think the foundation is there. The institution is set up."

Altman, 42, helped create the Anacostia organization, a quasi-government agency charged with acting on a 20-year plan to spend billions in public and private funds to revitalize the Southwest and Southeast waterfronts.

He announced last week that he is leaving in three weeks to take a private-sector job in New York for an employer whose identity he said he cannot yet reveal. "I've always been a dedicated public servant," Altman said in an interview on Friday. "This was something different for me. It wasn't just a question of money. It was a number of things I couldn't refuse."

Despite Altman's confidence that waterfront development will move ahead without him, local developers, D.C. leaders and real estate brokers said they are concerned about the District's ability to keep talented executives and to follow through on large-scale renewal plans.

"I think everyone believes that Andy's done a wonderful job of conceiving of the AWC plan," said Robert O. Carr, president of CarrAmerica Urban Development, one of the biggest commercial real estate companies in the area. "It's a great loss. [They'll] have to work hard to find someone to replace him. It's not going to be easy."

Before taking over the waterfront development organization, Altman served from 1999 to 2005 as District planning director and was a close adviser to D.C. Mayor Anthony A. Williams (D). Altman was known as a longtime cheerleader for some of the District's largest development projects, including ideas to turn the underutilized St. Elizabeth's campus in Southeast into a mix of housing, retail and offices and plans to build on the old convention center site at New York Avenue and Ninth Street NW.

"There was a sense of security knowing that Andy was in the city and his fingerprints were all over so much of what was taking place already," said Jim Abdo, a major housing developer in the District.

In 10 months at the helm of the Anacostia corporation, Altman had not been in the job long enough to have proved himself as a chief executive, said developers and board members. But he had added staff and taken control in planning what would be developed around the new baseball stadium in Southeast. Developers like Monument Realty LLC that have sunk $40 million into buying land around the stadium were waiting to see how Altman envisioned the area developing. He had put out a request to get ideas from developers on what to build on some publicly owned land around the stadium.

"The implications of his leaving are critical," said Douglas Jemal, who remains a major figure in District development despite his being accused in a recent indictment of bribing a D.C. official. "I'm not saying anything can't go on beyond him, but it's a critical blow. He's intricately involved in the planning."

Altman's resignation comes on the heels of Williams's announcement that he will not seek reelection.

"The combination of Andy leaving and the mayor's recent decision to not run for reelection means that certain significant initiatives have the potential to be stalled until there's some clarity in the replacement of Andy and there's a new mayor," said Marc Dubick, a developer who is building on the old wax museum site at 5th and K streets NW. "Losing momentum can result in slowing or terminating certain projects."

The Anacostia Waterfront Corp. board has said it will work quickly to name a new leader. And Altman said he wouldn't have left if the endeavor weren't headed in the right direction.

"People are upset I'm leaving [because] they believe the waterfront is a reality and not just a planning idea," said Altman. "That means they're committed to the waterfront. . . . I do feel we laid the foundation. We have changed the perception of the waterfront."

Going forward, D.C. leaders and developers said the waterfront organization needs someone who can navigate the politics of both the District and the federal government, which owns large chunks of land along the Anacostia River.

"You need someone who has a strong understanding of development," said Rich Bradley, executive director of the Downtown Business Improvement District. "They have to be a collaborator, a person who can build consensus."

Eric W. Price, the former deputy mayor for economic development in the District who left to take a job with a New York-based development group, said Altman's job should prove appealing to applicants.

"We have a situation in Washington where there's a pipeline of projects that attract people," said Price, who serves on the Anacostia Waterfront Corp. board. "We will still be able to find good talent who will come in and push these projects forward."

Appointment

David L. Winstead, 58, was named the new commissioner of the General Services Administration's Public Buildings Service. He will oversee 5,500 employees and 345 million square feet of office space that federal agencies, courts, border stations and laboratories across the country lease or own. The GSA is the federal government's real estate agency.

Winstead, a lawyer and former transportation secretary for the state of Maryland, started in the GSA job last week. He replaces F. Joseph Moravec, who served in the post for four years and resigned this summer to return to the private sector.

Winstead said he plans to continue the agency's programs to dispose of unused government property faster and its national leasing contract program, which has given the government more negotiating leverage in doing big deals.

Closings

* Brandywine Realty Trust of Plymouth Meeting, Pa., said it plans to acquire Dallas-based Prentiss Properties Trust, making it one of the largest office real estate investment trusts in the country. Prentiss owns about 20 office buildings in Tysons Corner, Bethesda and Herndon.

* Corporate Office Properties Trust, a Columbia-based real estate investment trust, spent $36.2 million to buy three office buildings in Colorado Springs.

* The District-based Carlyle Group said it has raised $930 million for its second European real estate fund. It will use the money to buy office, retail and residential properties in Europe.

* Akridge, a D.C. developer, paid $12 million for Gateway Plaza, a three-building office complex in Falls Church. CB Richard Ellis represented the seller, Falls Church Gateway Plaza LLC.

Staff writer Debbi Wilgoren contributed to this report. Dana Hedgpeth writes about economic development and commercial real estate. Her e-mail address is hedgpethd@washpost.com.

Andrew Altman, left, and the Rev. Joseph N. Evans of Mount Carmel Baptist Church last year at Mount Vernon Triangle.

David L. Winstead has been named the new commissioner of the General Services Administration's Public Buildings Service.