I’ve been playing around with different ways to achieve the city-management that I want within the 3D package, and I’ve discovered how valuable the “Cloner” tool is. This allows me to move multiple objects(in this case, buildings) into the Cloner, and it spits out duplicates in your chosen formation. Here are some examples; I think I will be using this method to expand the city:

We can see in the first two images I’m playing with the “radial” formation option – in the bottom and third screenshot, I’m utilizing the “grid array” option allowing me to create empty spaces working as roads in between the buildings.