Can you build another house on the same property?

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Say I buy a small duplex, on the same property could I build two more "tiny homes" and say the address was 235 a/b oak lane would it just be 235 a/b/c/d? This is probably a dumb question but I know dam well people build large sheds in front of their houses that are just as big as I very small apartment. Can this legally be done? Say I buy a duplex...on the same property can I legally building another smaller duplex on the same property and rent the small apartments out? Is this possible?