The pilot in command's misjudged distance/speed while landing, and the flightcrew's failure to follow prescribed emergency procedures, which resulted in a runway overrun and subsequent collision with a building. Factors associated with the accident are the flightcrew's inadequate in-flight planning/decision making, which resulted in a low fuel condition; an open hydraulic relief valve, and inadequate maintenance by company maintenance personnel. Additional factors were an inoperative (normal) brake system, an unactivated emergency drag chute, the flightcrew's failure to engage the emergency brake system, and pressure placed on the flightcrew due to conditions/events.