You do not have to spend anything to take a residential area and set it back down at another location. The same thing can be done with factories and city service locations such as government buildings and power plants. Paving roads is also free. Because of the free aspect of those action, you can use them to fix areas that were poorly planned. Extend a road and loop it around or drag it into a dead-end. Next, move the buildings that must be taken out of the way to the freshly-paved road, then rotate the buildings in and out as desired. When done, you can remove the new road if desired.