The Old Post Office Pavilion in Northwest Washington. (Jeffrey MacMillan/For Capital Business)

The GSA has not released information about who submitted proposals for the Old Post Office, but more than a half dozen developers have announced their plans to preserve and redevelop the historic structure, including the Trump Hotel Collection, Hilton’s Waldorf Astoria, the National Museum of the Jewish People, Boston-based Carpenter & Co. and a slew of local names.

Most of the declared proposals suggest turning the building into a luxury hotel, but others suggest office space, museums or housing.

The Old Post Office, at 1100 Pennsylvania Ave. NW, was built in 1899 and still houses some government agencies, but is considered underutilized. The government plans to lease the site to a private development partner and move the agencies elsewhere.

The Old Post Office also isn’t the only Pennsylvania Avenue landmark that could be headed for change. A recent report by the Government Accountability Office found that the J. Edgar Hoover Building, headquarters of the Federal Bureau of Investigation, was deteriorating and that the FBI may need to consider renovating the building or relocating.

Follow Jonathan O’Connell on Twitter: @oconnellpostbiz