Condo package deal question

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I am pursuing a deal of 16 condos that are fully leased out in a condo community of 88 total condos. That is not the attractive part about this deal. What pulled me in is that it comes with land within the same community, large enough to build 20-30 condo units and sell. My question is: how do I find out if there are any restrictions when it comes to building on this land. I just want to make sure there are no surprises later when I am about to construct the condo units. Any advice is appreciated.