The situation with older buildings in central Berlin is quite interesting though, because so many quite grand buildings on the eastern side went untouched for 50 years after the war. Then in the late 90s large areas of east-central Berlin were restored at some speed, from bullet-holed crumbling blackened stone to smart painted render in what I assume was something like the original style.
I once wrote a rather personal ramble that touches on this, here https://thebreakfastpost.com/2014/09/23/alte-schonhauser-str... with some pictures taken in 1993 of the area around Hackescher Markt. If you click through on one of the photos, there are a few more on the Flickr set that don't appear in the article.