 At the same time, it became the site of several municipal hospitals designed by Ludwig Hoffmann and Martin Wagner.Buch remained a Brandenburg municipality until 1920, when it merged into Berlin with the "Greater Berlin Act".The hospital area from 1928 hosted the Kaiser Wilhelm Institute for Brain Research led by neurologists Oskar Vogt, Cécile Vogt-Mugnier and biologist Nikolay Timofeev-Ressovsky; from 1931 it had its seat in a newly erected building designed by Carl Sattler.