Denver Firefighters were dispatched to 1515 Grant Street for a reported multi-family structure fire. Upon arrival companies found a 3 story apartment building with nothing showing and an odor of burnt food. Truck 8 gained entry into the fire unit with a water can and found a small kitchen fire which they initially thought was knocked. A suspected wind-driven fire event occurred and conditions quickly went from light smoke to zero visibility and high heat. The crew from Truck 8 visualized the open 3rd floor balcony doors and moved toward them while conducting a primary search. A victim was located and removed to the balcony by Truck 8 Firefighters who sheltered the civilian from the rolling flames. Truck 4 threw their aerial and a ground ladder to the victim, Rescue 1 made entry and conducted a primary search while Engines 1, 3 & 6 advanced lines for fire attack. Winds were gusting over 20 mph from the C/D corner toward the A/B corner and light smoke quickly turned to heavy smoke, high heat and heavy fire venting out of the alpha side. Firefighters from Truck 4 safely brought the victim to the ground while heavy flames rolled over them. An interior attack with multiple companies kept the fire to the unit of origin. All search proved negative, the lower floors sustained significant water damage and the Red Cross was called to assist residents. The injured occupant was transported Code 10 to Denver Health Medical Center.