Nice work! I like the ground veggies most, but the whole setting is very well done. I do have my reservations about the windows too; there also seems a weird reflection or hole in the sidewall behind it in the upper right big window. It's not correct somehow. Better dirty it up or something.
The stairs have a bit of a weird color IMHO, and I would add some flattish fakestones to it, or at least texture it procedurally in world space (like concrete). Even perhaps set it to displacement instead of RT rendering, for any fake stones to be effective.