A "condominium" is an estate in real property consisting of an undivided interest in common in a portion of a parcel of real property, together with a separate interest in space in a residential, industrial or commercial building on such real property, such as an apartment, office or store. A "condominium" may include, in addition, a separate interest in other portions of such real property. (Ord. 3474 § 2 (part); October 21, 1975.)