English speakers, how do you call half-finished flat/apartment?

If the flat/apartment has windows and doors and bare walls, how do you call it? Maybe "half-finished" or "half-completed" to refer to the fact that the remaining portion of the interior (tiles, etc.) is the responsibility of the future owner? Or maybe a flat with a base-level finish? We use such... show more If the flat/apartment has windows and doors and bare walls, how do you call it? Maybe "half-finished" or "half-completed" to refer to the fact that the remaining portion of the interior (tiles, etc.) is the responsibility of the future owner? Or maybe a flat with a base-level finish? We use such adjective in our language but I cannot find an equivalent in English
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