This kind of thing drives me crazy, both with people moving in moving out. A person who moved in a while ago thought it was ok to just dump all his moving debris (boxes etc.) and miscellaneous building materials in the courtyard – someone else’s problem. I was reduced to taking photos of the mess and dumping a number of items on his doorstep.
There are a few things you can do:
– as kiwipaul says, bill the owner of the lot for removal of the rubbish left by tenants. We do this – it is important to notify the managing agent when the stuff is dumped so you have a record and bear in mind you can’t force them to pay, or it is hard to. However when the lot is sold that amount is adjusted at settlement so you will get the money in the end. We did that with one owner whose tenants kindly left an old mattress in the entrance to the building.
– put up a sign saying anything left on common property will be considered abandoned, and will be disposed of.
When we have council clean-up we put out a notice saying that anything found on the common property will be removed, it is amazing what happens when you do that.
– I have a friend who lives in a company title block, their constitution provides that anyone who lets out their lot is required to pay an additional amount of bond money to the company, which is held as surety against having to meet costs like this. You can also use that money for damage to the common property caused by people moving in and out.
You could consider introducing a by-law to provide for the same sort of thing – legally I don’t know how this would fly, and it could be difficult to get passed where there are a lot of landlord owners, but I think it could be worth trying.