More informative and updated thread;
It's more than just a Ballroom, folks
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EXCERPT from OP;
Trump Details Military Complex Above and Below New White House Ballroom
The structure will feature a hospital, research facilities, meeting rooms, and dedicated spaces for military personnel.
5/19/2026|Updated: 5/21/2026
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WASHINGTON—President Donald Trump said on May 19 that when finished, his planned White House ballroom will be the “safest building ever built” and will serve both as a ceremonial venue and as a military-grade facility to help protect the nation’s capital.
Speaking to reporters about the project’s construction progress, Trump said the structure would be designed to withstand both drone and missile attacks, with “a massive drone capacity.”
He said the building will have a drone port on the roof to help protect all of Washington.
The structure will feature a hospital, research facilities, meeting rooms, and dedicated spaces for military personnel.
Trump initially announced the 90,000-square-foot White House East Wing ballroom project with an expected cost of $200 million. The estimated cost for the project has since increased to $400 million.
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“The only budget change would be that we doubled the size at the request of the military,” he said.
The president said the building goes six stories underground and is highly complex, integrating both drone and missile protection systems, along with drone capabilities on the roof. According to Trump, the roof will also accommodate snipers, who will have “a very clear view” of Washington because of the building’s height.
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“This is really for other presidents. This is not for me,” Trump said. “This is my gift to the United States of America. I’m going to be able to use it very little.”
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The structure will feature a hospital, research facilities, meeting rooms, and dedicated spaces for military personnel.
www.theepochtimes.com
More details and sources/links in that thread.