i was interviewed at a clinic/office down the street from montefiore. the admissions office was extremely nice and they gave me clear directions, along with the shuttle schedule, where they highlighted the time i needed to be on the shuttle, going and returning, as well as a map of montefiore and the surrounding area. it was a bit of a walk in the cold weather, but not bad.
about the envelope, just like faradayampere said, they give it to you to give to your interviewer. the secretary took mine, and he read it before the interview, although i've heard of others handing it directly to the interviewer who reads it during the interview. it's kind of a weird system, but luckily my interviewer seemed to pay attention when he read it and asked me a lot of questions pertaining to my experiences that i mentioned. do you have an interview there? good luck!