Engine-20 arrived reporting heavy fire from the 2nd floor of a 4 story bldg, placing 2 & 2 in svc. B/C-4 arrived and placed all hands in svc, reporting heavy fire 2nd floor with heavy smoke through the 3rd & 4th floor and roof. B/c-3 req the emergency evac tones for all F/F's to evacuate the bldg. Companies went to an exterior attack. The 2nd & 3rd alrms were requested. Dep-1 (Marchisello) had all hands from the 2nd alarm and 2 engines from the 3rd in svc on an exterior attack, with the remainder of companies standing by. Fire extended to the 3rd & 4th floors and into the roof area and the "D" exposure. Companies re-entered the bldg to open up and hit hot spots. The fire was placed under control in just over an hours time. Correct address of fire was 339 n. 11th st with extension to 337.