This reminds me: have you considered the suggestion to add a dungeon part to the turn summary screen, necno? I'm pretty sure this was brought up once, but I can't remember if you said "no", "sure, just not now" or "sure, expect it to happen soonish". With the building upgrade coming on, would this be a good time to throw that in there since there's a chance you'll have to mess with some of the turn summary screen display anyway?
Which, actually, brings me to another point you've probaby already considered: how, if at all, will you change the TS when you create the new building types? I'd like to see a couple lines on the building you're looking in the TS. Obviously, you show the name, but the building type, total and available girl slots, number of customers, and building income could all be shown here as well. Perhaps you could have a building summary display exactly like the girl summary, as a selectable option? The only tough (or at least, ineffecient) thing I see with that is displaying the summary at the top instead of tha bottom, since my limited coding skills tell me that requires some neat programming judo.