My suggestion would be for each SMLLC to collect rent and pay its own expenses. The reason is that this way it will not blur the entity separation. Better for asset and liability protection. The fact that the properties are in different states also advocates for this method.
SMLLCs do not file their own tax return. The sole member reports the income and expenses on its own return. That is to say, the MMLLC will file Form 1065. You will report each property on a separate 8825. Then the net of the rental activity will flow to Schedule K-1. And each LLC member will, in turn, report that income/loss on their own tax return.
The MMLLC will probably be required to file a multi-state return to show the activity in each state.
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