A short-term residential rental unit is a residential dwelling unit or portion thereof rented or otherwise used for residential transient occupancy, as defined in § 14.0203. A short-term residential rental unit shall not be used for any commercial activity, which includes but is not limited to weddings, wedding receptions, corporate retreats, business meetings or conferences, filming photography shoots, a fraternity party, or any other similar gathering, unless regulated under an approved County-issued permit. Transient occupancy generally means occupancy for 30 consecutive calendar days or less.