If proposing to assemble a vertical license within the HC Zone, the operation shall first begin with the retail operation before being able to co-locate with a cultivation and/or manufacturing license. If proposing to assemble a vertical license with the OSRA, the operation shall first begin with the cultivation and/or manufacturing license before being able to co-locate the retail license. In both cases, the area of the proposed premises utilized for cultivation and/or manufacturing shall be both screened by the retail operation and physically separated from the area of the premises utilized for the sales of cannabis that is open to the public or to patients. Walls, barriers, locks, signage, and other means shall be employed to prevent the public or patients from entering the area of the premises utilized for cultivation of medical cannabis.