Davenport sits in the Quad Cities, which straddles the Iowa-Illinois line. Like Kansas City, a portfolio here can run under two states' rules at once, and the two do not agree.

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Iowa rules that apply here
Iowa caps the deposit at two months' rent, gives 30 days from termination and receipt of the tenant's mailing address, and assigns interest earned during the first five years to the landlord. Illinois applies a different framework with obligations that vary by the size of the building. A single company-wide deposit policy and one move-out workflow cannot be correct on both sides of the river.
The interest treatment is the sharpest divergence, because it is not a timing difference that a conservative process can absorb. Whose money the interest is depends on which state the property sits in and, in Iowa, on how long the tenancy has run. That has to be driven by property attributes rather than by a portfolio-level policy.
The practical structure is the same one that works in any border metro: state as a first-class attribute of each property, driving the cap, the clock and the interest treatment, with the portfolio still reported as one book to the owner and split by jurisdiction for compliance.
Iowa 562A.12 caps the deposit at two months' rent and requires return, or a written statement of deductions, within 30 days from termination AND receipt of the tenant's mailing address or delivery instructions, so the tenant's act starts the clock.
Iowa's interest rule runs opposite to most states: any interest earned during the FIRST FIVE YEARS of a tenancy is the property of the LANDLORD, and after that it is not. A five-year ownership boundary is genuinely unusual and it makes tenancy start date an accounting input, because a portfolio with tenants either side of it cannot use one blended treatment. Deposits must be held for the tenant at a federally insured institution and must NOT be commingled with the landlord's personal funds.
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No. Iowa and Illinois differ on the cap, the clock and the treatment of interest, so a single policy is wrong on one side by construction.
Interest. Whose money it is depends on the state and, in Iowa, on whether the tenancy has passed five years. That cannot be absorbed by a conservative blanket policy the way a timing difference can.
State becomes an attribute of each property that drives the cap, clock and interest treatment, while the owner still receives one consolidated report.
Other Iowa markets, the platforms we work in, and the functions available on their own.
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