If you want to get in the door, possibly ? we charged $50 or so just to make a few passes on a short driveway. a couple of those is well more than that hourly rate. also,, the more snow,, the harder it is on the equipment. up to 4" was one rate, 6" was another and above 8" the price went WAY up. i would make sure they don't expect to pay $80/hour for the truck, skid loader and backhoe if a blizzard hit's. each one should be seperate, as well as salt and spreading if you do that also, and any other extra's if needed.
measure the lot size or guestimate it. then call another place locally and have them give an estimate. you don't need to tell them who or where, just that it's a commercial lot in "anytown".