Judith Diamond, in London wrote:
"My father studied at the Mommsen Gymnasium in Charlottenburg, Berlin until 1917.
Can anyone give me more information about it, its precise address,
and whether the building survives?"

If you search under google.de, you will get a few hits, including a
reference to a publication of the Berlin Mommsen-Gymnasium, but also a
few other genuine references, if you ignore the ones >from other German
towns like Leipzig or Flensburg where other Mommsen-Gymnasiums exist:

http://www.flb-gotha.de/schulschriften/charlottenburg/ch_mgym.html

With kind regards

Fritz Neubauer, North Germany