Initially, I venture to say that a single family home in Seven Hills does have excellent potential for rental income, pending the right circumstances. Do the HOA & your lender allow the home to be a rental? Contact a local agent who handles property management and discuss which areas and types of home would rent in a swift fashion for a great price. If you could find an outfit that handles both sales and property management, it could be a seamless transition.
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All three communities are excellent - it is purely a matter of preference. Once you see the communities for yourself, I'm sure that you'll have an opinion about which is right for you. I work with a lot of buyers who are relocating or purchasing from out of state, and I would be happy to tour these communities with you so you can get a feel for how they differ.