Is there anything important to know about condos?

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I plan on buying a place that I'll live in and I'll rent out the other room to a roommate to help pay off the mortgage each month. I am in NYC so there's no shortage of roomates here. However, it looks like the only thing in my price range are condos in New Jersey. I know nothing about condos (I will research them on the internet). Do they usually have any weird rules in general and in particular against having roommates?