To everyone caring about rocks and/or ponds (and because someone mentioned the different pavement sizes in front of the main buildings)
: Marisa from petal-parasol put together
a very helpful guide about the different versions of the town hall, town tree, and re-tail, including pictures and information about how they always come with a rock and sometimes pond.
Here's the link again:
Guide to town hall, town tree, and re-tail variations
That means that some rocks will always be near the buildings, and resetting for no rocks near buildings or something will never result in a town you like.
Good luck and have fun