Your scholar can also try the Berlin city government's FIS Broker,
http://www.stadtentwicklung.berlin.de/geoinformation/fis-broker/

What might be helpful could be
- aerial photo map (Luftbilder) from 1928,
- building age map (Gebäudealter) from 1992/93
- Berlin um 1910
- Berlin um 1940
Maybe also the State Library of Berlin (Staatsbibliothek zu Berlin) might
be able to help
https://staatsbibliothek-berlin.de

Hope these can help out a bit.

Regards from Berlin,
Joshua
-- 
Joshua Davidowitz
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On Thu, Mar 28, 2019 at 9:31 PM Weessies, Kathleen <[log in to unmask]>
wrote:
>
> A scholar is looking for detailed maps of Berlin from the 1930s with
building-level information.  The usual methods haven’t turned anything up,
the largest scale I have seen so far was around 1:25,000.  The general rule
is to find exceptionally detailed information near the locality being
studied.  I’m not familiar with the mapping projects and resources of that
place and time.  Any ideas?
>
>
>
> Thank you,
>
>
>
> Kathleen Weessies
>
> Social Sciences Coordinator; Head, Map Library
>
> Michigan State University
>
> [log in to unmask]
>
> 517-884-0849
>
>