Ann Arbor's rental year runs on an academic calendar, which means a portfolio can turn over a very large share of its units inside a few weeks. Michigan's deposit rules are written for individual tenancies, and they apply to every one of them simultaneously.

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Michigan rules that apply here
Concentrated turnover converts a manageable obligation into an operational one. Every unit vacating in the same fortnight starts its own 30-day itemisation clock under MCL 554.609, and each requires an individual list with estimated repair costs and the basis for each charge. The consequence of missing any one of them is that the landlord is treated as agreeing no damages are due for that tenancy, so the failures are unit-by-unit rather than portfolio-wide.
The inspection bottleneck is the real constraint. Hundreds of units cannot be inspected, costed and documented in the same week by the same people, so the sequencing has to be planned before the turn rather than discovered during it. We work backwards from each unit's own deadline instead of treating the turn as a single event with one due date.
The volume also makes documentation quality slip precisely when it matters most. A rushed list of round-number charges with no basis is exactly what the statute does not accept, and it is what gets produced when three hundred move-outs are being cleared at once. Tying each charge to the inspection record and the actual cost is the difference between a defensible file and a full refund.
Michigan MCL 554.609 requires the itemised list of damages, including the estimated cost of repair for each item and the basis for the assessment, to be mailed within 30 days after termination of occupancy. Failure to comply constitutes AGREEMENT by the landlord that no damages are due and the full deposit must be returned, so the right to retain does not shrink, it disappears. A second clock follows: where damages are claimed and disputed, an action generally must be commenced within 45 days of the tenant vacating or the tenant may recover double.
Michigan caps the deposit at one and a half months' rent measured against the rent actually charged, and requires a move-in inventory checklist that functions as the baseline for every later deduction. Because the cap follows current rent, a deposit rolled forward when a tenant transfers units can quietly exceed the permitted maximum, so it has to be recalculated on transfer rather than carried across.
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By working backwards from each unit's own 30-day deadline rather than treating the turn as one event. Every tenancy has its own clock and its own consequence for missing it.
The failures are individual. For each tenancy missed, Michigan treats the landlord as agreeing no damages are due and the full deposit for that unit goes back.
No. The statute expects estimated repair cost and the basis for each item, and round-number charges without support are what gets produced under time pressure and what fails when challenged.
Other Michigan markets, the platforms we work in, and the functions available on their own.
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