Part of the function of borough streets adds something per tile, other things are added "per level". What does that mean? You can level them up somehow? I tried building a borough street on top of an already existing one but that wasn't the solution.



Edit

Argh, I just noticed the thread not too far below this one that answers my question. I actually scanned through the first four pages on this board and somehow missed that. Delete this at you're leisure, mods. I can't seem to do it myself.