On the wall of this building (Anna-Seghers-Straße 91) there should be a memorial plaque of Georgi Dimitrov.

https://bg.wikipedia.org/wiki/%D0%A4%D0%B0%D0%B9%D0%BB:Gedenktafel_Anna-Seghers-Str_91_(Adlh)_Georgi_Dimitroff.JPG