Jersey City NJ (Hudson) 9-22-99 @ 00:15hrs Fire Dispatch transmitted box 529 for a fire reported 220 Monticello Ave. Upon arrival of the first due companies, Fire Dispatch advised responding units they were receiving multiple calls of people trapped. Eng 9 the unit on the scene advised they had a 3 stry brk with fire throughout and had a jumper which just jumped from the third flr and requested EMS forthwith. Upon the arrival of Batt 4 he requested a 2nd alarm and 1 min later requested a 3rd alarm. The fire extended to exposures B & D and all units were heavily engaged. At the height of the fire there were 2 ladder pipes and a tower ladder in operation. Once the fire was brought under control a primary search got underway and (1) body was found on the third floor.Deputy 1 requested an additional 1&1 due the heavy volume of fire. The jumper is in critical condition and this fire is under investigation.