Take the number 6 train to 28th street [Park Ave& 28th Street]. Exit at 28th street and walk east past Lexington avenue, then 3rd Avenue. There is a 7-11 store on the corner. Continue on 28th street passing Starbucks to "The Chesapeake Building " Use the doctor's office entrance and ring the bell for the doorman. If you pass the parking garage you have walked to far. Turn and backtrack about 10 feet.
Take the R train to 28th street [Broadway is the cross avenue].
Exit station at 28th street and walk east. You will crossing 5th avenue, Madison avenue, Park avenue, Lexington avenue, and Third avenue. A 7-11 store is on the corner. The entrance to the building is on 28th street. Use the doctor's office entrance.