This fire is right around the corner from E102/T25. T25 was on an ambo assist with E102 coming in as the ALS assist. E102 passed the fire, supposed to be first in, but was told to continue on to the ambo run. Bat. 9 first in with E59/T47. Companies had a hard time gaining access to, and finding the fire in the basement. Fire was also reported through the roof at one point. Upgraded to a 2-11 and then a mayday was transmitted, but mayday soon struck when all personnel were accounted for. High Expansion Foam Unit brought in from 26's house. E102 supplied SQ 2A in the rear. Co's that I saw were: E59,70,56,110,102,83,71,26(with 631), T47,12,25,TL23,21, SQ2,272, and so on...