Sorry if there the same suggestion, I read a few but I didn't get.
I have 2 suggestions:
1- When you are trying to put a building, could be an option has a 'guide' that help to you to put a building beside another. The problem is that from your perspective is hard to put a building in the right position.
2- From point 1, another option maybe is that with the hammer you could 'rotate' or 'move' the building to fix in the right position.