I'd guess the stairways are part of the building, right? In that case, it'd just take a skilled artist to create.
Pretty nice buildings overall, fit the general elven culture well. Although I probably won't play orcs much, I do plan to play elves a bit. As such, I'm quite pleased with the way the buildings look. Some of them look quite similiar, but there are enough significant differences to differentiate one building from another. Great job to both the art and modelling departments. Also, it looks like each building has a significant effect and unique use. Well done on the concepts. The Alchemy lab sounds especially interesting, sort of like a more effective market.