The first two were made on the train stations (S-Bahn) of Westhafen and Halensee, respectively, the third is a view of Skalitzer Straße in sunday morning sun, and the fourth shows three houses in Lichtenberg's Wartenbergstraße.
Only the one in the house middle seems to be inhabited still; the windows in the house on the left are all already broken. I'll have to go back on a day warm enough to draw in more detail. This was done yesterday early in the morning, when the sun suddenly disappeared and a cold wind made me hurry up.
P.S. This weekend is Berlin Gallery Weekend, and I have written a little guide to the exhibitions focusing on painting and drawing.