You register a medical treatment, pharmacy facility in a building. You serve no clients however. You stock it with the drugs and supplies you need. A "staff doctor or pharmacist" can then legally dispense the drugs you want without any disclosure. The only people who know is the people who own the medical treatment facility, which is most likely the Clinton Foundation. I bet it's charter is to provide healthcare services to the poor, or something like that? Hillary can't pass up a tax dodge times two?!
I ran into a few such operations in unoccupied buildings. Just a sham location for drop offs and pickups. Also makes you compliant with the controlled substances / shipping / delivery requirements.
Does CHelsea have the 4th floor of that building?