Basically there is no real formula to determine the uses of the common areas by the tenant. As indicated by @AmyC the expenses can be prorated based on your records and percentages. The unit itself is used by both for whatever they choose when it comes to the common area and there's no real ability to determine a depreciable asset since there is equal personal use by your child.
The common areas definition doesn't change the fact that it is equally used for personal purposes and by the tenant. If you had another tenant that was not related to you and being charged fair rental value (FRV) then it would be different,
@joeh31
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