A few questions I keep meaning to ask-)
the first one is about the color wheel and how to color different areas of an object for example whenever I change the color of the top of a dive bar the base of the bar color does not change even if ...
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When you try to place a building on an existing lot, you're trying to place a new lot on top of the one that's already there, so no, that never works, either for residential or community lots. You can only place buildings on vacant lots. However, you can place rabbithole shells on existing community lots, but I that's probably not what you were trying to do.
