Where to visit David

I see I omitted the very crucial information about where David's secret location is.  St. Vincent's Hospital is on W. 12th St. between 7th and 6th Avenues, on the south side of 12th St.  There is a big blue awning that marks the main entrance.  This is not David's entrance, however. Proceed along 12th St. towards 6th Avenue and you will see a second, smaller blue awning.  This is David's secret entrance.  Enter and the security guard will further instruct you.  Generally, you have to tell him you are visiting Shohl on Reiss 2 and sign in.  Then you just take the elevator to the 2nd floor.  You have to ring the buzzer to be let in to David's unit.