Luli -
The two vanilla terms simply refer to properties that are ready to be moved into, but have no final covering on their floor or walls, allowing the new owner to lay down whatever material they wish. Grey shell refers to the buyer deciding what to do during the construction phase of the apartment or office. Perhaps a quick desription would work in place of a one or two-word translation, because they seem pretty specific and I haven't heard anything similar in Spanish.
Best of luck.
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