Imagine, if you will: you have a building with over a hundred units, all independently owned. How do you operate that building? Who decides when it gets painted, in what color? Who decides what temperature to have the pool? Some people might want it cold to save money. While some people, who use it more, might want it warmer. Everybody has a different agenda.
So, how can you ever operate a community full of people with similar but different priorities? Simple, it's called the homeowner's association.
What Is a Homeowner's Association or an HOA?