It was a separate borough from 1920, when it became a part of Groß-Berlin, until the borughs were changed in 2001. Then it was joined with Friedrichshain to form the new borough of Friedrichshain-Kreuzberg. Since these two localities are linked only by a single bridge over the Spree river, the Oberbaumbrücke, this joining seemed awkward to many residents. The two areas could not agree on where the new borough's town hall should be. Friedrichshain was chosen by tossing a five-Mark coin.