Thanks, I much appreciate it :) I must warn you, that nowadays Urbex sites in Berlin city became quite complicated to visit if you are looking for that primarily. The last years, the inexorable fast (and sometimes unreasonable) sales of real estates led to have private companies watching such buildings and requesting law enforcement for trespassers which will apply huge fines... This used to be mostly true for venues inside the City, and the center, but nowadays even remote structures are being watched, and I talk by my own direct experience; last year I wanted to bring a friend to the Johannisthal Airfield (which used to be totally easy to access and relaxed, even if it's in front a Polizei department), and while still being outside, we got stopped, questioned and iD checked by law enforcement, which was actually looking for somebody who was already inside the building to put the (huge) fine on them. After we clarified that we weren't inside, they invited us even to leave the area... and so we did.
But there are still things more remote from the city center that can be accessed and enjoyed somehow, so my guess is that Leipzig despite being much smaller, may have a lot more to offer nowadays ;-) (at least arbout urbex sites...)