A "mixed-use building" shall be defined as: a building of two or more stories with a minimum of the ground floor consisting of exclusively nonresidential uses, with the exception of residential entrances and/or lobby areas, and a minimum of one floor of residential uses over one or more floors of permitted nonresidential uses. For purposes of this definition, nonresidential uses shall include: retail and personal sales, service uses, office, storage and equipment facilities, community rooms and off-street parking.