"The Bundespräsidialamt (Office of the Federal President) is a federal agency (German: "oberste Bundesbehörde") of the Government of Germany assisting the President of Germany.
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is situated beneath Bellevue Palace in Tiergarten in Berlin. The seat was formerly in Bonn in the Villa Hammerschmidt and switched to Berlin with the Berlin-Bonn Act. The agency moved into the actual building in 1998.
The current head of the Bundespräsidialamt is State Secretary Stephan Steinlein." - (en.wikipedia.org 25.10.2021)