28-02 - Definitions LAST AMENDED 3/22/2016 Dwelling unit For the purposes of applying the provisions of this Chapter to philanthropic or non-profit institutions with sleeping accommodations and to #long-term care facilities#, the term “dwelling unit” shall include #dwelling units# and #rooming units#, as set forth in the New York City Housing Maintenance Code. Vertical circulation core A "vertical circulation core" is an elevator core (consisting of one or more elevators) or a central stairwell in a non-elevator #building#.