Corrected entry: Holly lives on the second floor and she goes up the fire escape to Paul's apartment on the third floor. However when Paul returns from shopping he enters the building and goes right into his apartment on the first floor.
bnemirow
22nd Feb 2011
Correction: Actually, the first door to the right of the screen leads to the staircase, which is locked unless you have a key, or you buzz Mr Yumioshi.