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@Just-Lisa-Now- wrote:

If the units can be sold individually from one another, Id keep them separate. 

If the property can only be sold as all 4 at once, I'd lump into one.

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I agree with Lisa.  Another circumstance to consider separating them all now is if one of the units will  ever be used for personal use.  If a unit may be used for personal use, I think it makes it easier to separate them out now, rather than later.