At 0217 hrs units were alerted for a report of smoke coming from a row of businesses in the 5900 blk of MLK Ave. Engine 332 and Tower Ladder 33 responded on the run with 9 volunteers. Engine 81 (Seat Pleasant) arrived on the scene along with Tower Ladder 33 to find a one story commercial strip with light smoke showing and water running from underneath the Murrys roll up doors. A bystander on a bicycle indicated that he also believed it may be coming from the Murrys. The Tower Ladder crew worked on forcing the front roll up doors as Engine 332 took a position in the rear where Quint 22 (Cheverly) worked on the rear roll up doors. Once the roll up doors were opened crews found thick smoke conditions in the store and an activated sprinkler. Tower 33 initiated a large area search utilizing the thermal imaging camera as the Engine companies located a fire involving a refrigeration unit. The Tower outside team ventilated the building and worked to control the utilities as the primary search turned up negative results. Crews operated for just over an hour before returning to service.