The General Services Administration is preparing to terminate about 1,000 federal real estate leases by the end of this week, a significant portion of its real estate portfolio.

The source told Federal News Network that in some cases, agencies “are not fully aware that their buildings are on the list.”

“We’ve already had lessors and agencies reaching out asking why they have DocuSign docs telling them the GSA is terminating. Sounds like zero communication to agencies or landlords took place,” the source said.

GSA is exempting leases from a variety of agencies and components — including the Departments of Defense, Homeland Security, Veterans Affairs, State, the FBI, Drug Enforcement Agency, U.S. Marshals Service, Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), Social Security Administration, intelligence community and the Executive Office of the President.