If they have normal privacy locks, simply replace those with keyed entry door locks. There will be no drilling or damage to the doors. When they leave, if you want, replace with the original privacy locks. This takes only 4 screws and about 10 minutes to replace these. Yes, you'll have more keys, but happy tenants and no damage to the doors. If these are old original Victorian doors, simply find the right skeleton keys to the doors. Almost all of these had the skeleton keyed locks. Give a skeleton key to the tenants. If they are all keyed to the same lock, replacement locks are available for these. It costs a little more than a lock for modern door, but there will be no damage to the old doors.
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