The best way for you to determine your ability to enter the rental that you were occupying that has severe fire damage to possibly obtain permission of your belongings that may not be damaged is to contact the fire department that was at the scene of the fire to see if access is safe.If access is safe, then technically you as the renter who had possession of the unit at the time of the fire should be able to go inside the unit to see if there are any items belonging to you that have not been damaged by water, smoke or fire.