At 1326 hrs units were alerted for a report of a building on fire in the 3800 blk of 64th Ave in Landover Hills. Engine 331 (4th due Engine) and Rescue Squad 33 (3rd due Special Service) responded on the run with 9 volunteers. As the crews turned left out of the firehouse a column of smoke could already be seen rising from the reported area. Engine 301 (Landover Hills) arrived in the area to find a 1 story in the front 2 story in the rear storage facility with fire and smoke showing from several units. Rescue Squad 33 arrived soon after E301 and brought their RIT supplies and saws to the front of the fire building. RS33 along with Trucks 9 and 28 began work on the large number of roll up doors that needed to be opened. Engine 331 arrived 3rd and laid a line from Annapolis Rd into the complex and took a position out of the way of other units. With the initial report of a large volume of fire, Engine 331’s crew disconnected the “Detroit” bundle load and deployed the 2 ½” line below utilizing a stack tip nozzle. The crews of Rescue Squad 33 and Truck 9 worked to gain access to the many roll up doors as Truck 28 positioned ladders. Command requested a task force sounded and assigned the RIT duties to the next arriving special service, allowing Rescue Squad 33’s crew to assist with the large number of special service duties to be done on this fire. The tenants of the storage facility were getting their moneys worth as many of the involved units were stacked from floor to ceiling with materials, one even having a makeshift workshop inside. In all, fire was found in over 7 units with smoke and heat damage effecting more than 20. Crews worked for several hours to clear out debris and knock down smoldering hot spots before returning to service.