You should go talk to 3-4 general contractors that do light commercial/residential construction in your area. Ask them for a ballpark figure for a project, or cost per sq foot. Take their answers and you would have some kind of rough basis for cost.
Once that is done, you would want to have an attorney look over zoning and real estate issues for putting a house like this somewhere legally, then have an architect paid to draw up plans that can be submitted for a bid. A 20 Bed light commercial property would be at least 7-8 hundred thousand dollars I would think, in addition to the land cost.
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