Washington (CNN) A former top-ranking General Services Administration manager admitted to having sex on the roof of the agency's headquarters building and drinking alcohol in the office, according to an inspector general report made public this week.

Brennan Hart, a former associate administrator and acting chief of staff at the GSA, admitted to GSA Inspector General investigators that in the summer of 2017, he had sexual relations with an official from the White House on the roof of the building.

Hart said he made the unidentified White House staffer and himself drinks with vodka he kept in his office and they had sexual activity that began in administrative suite area and ended with oral sex on the rooftop of the building. The name of the White House staffer was redacted in the report released by the GSA. Hart also acknowledged drinking alcohol in the building, but only after business hours.

Investigators attempted to interview the White House staffer but they declined to be interviewed, saying any such interview would need to be approved by the White House counsel, according to the report. The staffer never contacted the agents to follow up, the report states.

Hart did not immediately respond to a voicemail from CNN on Thursday afternoon. His employment with GSA ended days after the report was made in March 2018, according to the agency.

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