A friend of mine inherited a commercial lawn mower that I'm interested in buying; however, neither of us are sure of its value. What we do know is that it is a Toro ZMaster riding mower with 550 hours. It has a Kawasaki engine and is liquid-cooled. The model # is 74212-991001 and the serial # is Z262L. It has a 62" side-discharge and appears to be in good condition. Can anyone provide an estimate of value based on the above? Thank you for your help!