Heritage residential building for assistants, students and night watchmen of the <a href="https://en.wikipedia.org/wiki/Berlin_Observatory#Berlin-Babelsberg_Observatory" class="extiw" title="en:Berlin Observatory">Babelsberg observatory</a>; Karl-Marx-Straße 35b, Potsdam-Babelsberg
<a href="//commons.wikimedia.org/wiki/User:PantherStrix" title="User:PantherStrix">PantherStrix</a>
<span class="int-own-work" lang="en">Own work</span>