Trump Proposes Demolishing FBI Headquarters
I have no idea if the article is accurate but I agree with the idea.
Return the land to parkland, or make it available for some other public space, a fountain, or perhaps a monument. Americans should not tolerate the fascist Brutalist style in the capital.
The majority of all federal workers and jobs should be moved out of Washington, leaving only the senior management of the agency. The FBI should be spread around the country to places much less expensive and closer to the regions served. The training, administration, and support functions should be unified in a central part of the nation. Kansas springs to mind.
Unsurprisingly, Obama chose the Brutalist style for his Presidential library.