Is the backyard enclosed? Meaning, is there ready access to an existing parking pad behind the house either by a driveway down the side or a lane way out back? Does the property have an approved front yard parking pad? If not, you may be pooched. The residential parking bylaws do not give special consideration to the size of the vehicle, as long as it's motorized it's subject to the same reg's that cars are. Toronto residential parking regulations could be on the LL's side. I suggest you check with the city to determine what the house is legally zoned for and try to negotiate with the LL from there.