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Mr. Costa received the Presidential Rank Award in 2002 as a “Meritorious Executive,” and in 2004 was a “Distinguished Executive,” according to the agency.

A convention directory for the Las Vegas conference, obtained by The Washington Times through the Freedom of Information Act, listed a total of 13 GSA employees, including Mr. Costa, from GSA’s central office in Washington as participants.

Two others, Robert A. Peck, head of GSA’s public buildings service, and Stephen R. Lees, who was a top adviser to GSA Administrator Martha Johnson, were forced out of the agency in the wake of the conference scandal. Ms. Johnson, who did not attend, resigned when the audit on the conference became public.

Another top official, David Foley, deputy commissioner of the public buildings service, also attended. He was suspended but has since returned to work.