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Fluffybull Home Owner's Association.
Sometimes, when a single builder or developer builds an entire subdivision, they have very specific ideas about how each home should look, even after they sell them. In order to achieve this level of control over the lives of other people, they create an HOA. It's basically a small corporation (but not for tax purposes), run by some of the original purchasers of property in the subdivision, and it enforces petty ass rules like how tall people's lawns can get, what kind of trees can be planted in the front yard, how long people are allowed to go before painting their fence or their house, etc.
Even new houses built by other developers in the same subdivision are subject to the rules of the HOA. Some of the rules include that each house has to have a certain amount of brick façade in the front, and so forth.