I was in the same position your're in right now two months ago, property magagemet co we deal with asked us to bid some plazas, max a pickup could do, one was two big I didn't even bid it. My contact(maintance guy)that was contact person said they were "all inclusive contract"meaning shoveling walks, plowing lots ice control on both. I was confused because their was also a price per ton for salt? After I submited the bid I found out salt was not to be include in price, I was told I was the higest by far(1 property by $ 10,000), They went with the lowest bidder, the guy is a crook, I know I bought a truck from him. I figure he's lowballing the plowing & adding extra salt that's never used or salting constantly. Now I know.
Sucks they were two year contracts, the way contact was talking they wern't even up for bid, I already had them. O'well I know now learning from experience, each contract is different.