Since I'm doing mockups anyway, I thought I'd go ahead and mock up the crossroads I envision for 2.0 Downtown (and whatever we call it).
0,0 would be right where that tower sits in the middle of the street intersection.
The street and sidewalk bits are half slabs laying on the ground so mobs won't spawn on them. The four intersecting lots would be for Com/Ex, Post Office, Chicken Mart, etc.