We have this situation where one of the residents in a strata building lost her key to the main gate of the secured building. It was rather silly because there are 2 of them living in one of the units and they shared the key to main gate by leaving it in the mail box!!! And, of course it was stolen or lost or whatever. The person did admit to be at fault. There is now a potential risk to all residents that some unsavvy character has got the key to the secured building. We want to get the lock changed. My question is who should pay for this? Should the owner of the unit - it is being rented - and claim it back from their landlord insurance (not even sure if landlord insurance policy will cover this?)? Or, should the owner deduct the cost of a new lock (and keys) from the tenants' rent? Has anyone had this situation before? Any advice would be appreciated, so I could go back to the body corporate and tell them what to do. Many thanks.