Squad 33 was sent as RIT to the chimney fire on Nursery Rd at 08:00 Thursday. While responding, a second call was sent by York on Trinity Dr for a Gas Leak Inside. The response route had us passing this incident to the to the first incident. Squad 33 advised York of our location and after they checked with Command on the Chimney Fire, the Squad diverted. Squad 33 staged at a hydrant with the crew performing a 360 of the building then meeting Co. 23's crew to assist with investigation inside. Truck 45 arrived and set the main to the roof to check HVAC units. No conditions were found inside and after a walkthrough with Columbia Gas, the incident was released. Chief 23 held the Command. This was the 3rd of 4 calls for Thursday.