What “tax-exempt property” means in Des Moines

The phrase tax-exempt property sounds simpler than it is. In the Polk County Assessor’s records, it means that some or all of a parcel’s assessed value is not included in the property-tax base. It does not mean that the owner pays no taxes of any kind. It does not, by itself, say whether the exemption is good policy. And it does not tell you that the parcel is owned by government.

This site starts with the narrowest claim the source can support: the Assessor’s commercial inventory identifies 796 exempt or partially exempt commercial and multi-residential properties inside the City of Des Moines. Their full assessed value is $2,608,998,890. After subtracting the $80,840,300 that remains taxable on 31 partially exempt parcels, the net exempt value is $2,528,158,590.1

Who can qualify?

Iowa Code Chapter 427 contains a long list of property that may be exempt from taxation. The most familiar provisions include property used by religious, educational, literary, and charitable institutions, subject to conditions in the statute.2 Eligibility turns on facts such as ownership and use. The name on a deed is relevant, but it is not the whole legal test.

That is why this site does not decide that an exemption is valid or invalid. It reports the Assessor’s classification. A reader who believes a record is wrong should take that question to the Polk County Assessor, not to an algorithm.

Fully exempt and partially exempt are different

Most records in the database are wholly exempt: their full assessed value is removed from the tax base. But 31 parcels are only partially exempt. Mercy Hospital Medical Center’s parcel at 1111 6th Avenue, for example, has a full assessed value of $262.3 million and a net exempt value of $227 million; $35.3 million remains on the roll.1

For those parcels, using the full assessed value as “exempt” would overstate the result. Our calculation is therefore:

Net exempt value = full assessed value − value still on the tax roll

Both figures remain visible on the property page. The subtraction is not hidden.

What is in this database?

The source file is the Assessor’s Commercial Inventory for Polk County. It contains owner, occupant, parcel number, address where assigned, land value, building value, full assessed value, adjusted value, class, occupancy, zoning, and projected coordinates. We selected records in the Des Moines jurisdiction whose class codes identify them as exempt or partially exempt.1

The database includes hospitals, schools, churches, care facilities, housing, offices, parking facilities, and vacant land. Its largest net exempt records are Central Iowa Hospital Corp at 1200 Pleasant Street ($273.7 million), Mercy Hospital Medical Center at 1111 6th Avenue ($227 million net exempt), and Des Moines University Osteopathic at 3200 Grand Avenue ($113.8 million).1

What is missing?

The most important omission is government property. City, county, state, federal, and public-school property is generally never assessed rather than assessed and then exempted. It does not appear in the commercial inventory used here. The City of Des Moines says that approximately 40% of properties in the city are tax-exempt, a broader statement than this dataset can measure.3

Residential-class exempt property is also outside the source file. For those reasons, $2.528 billion is not presented as the value of all untaxed property in Des Moines. It is the verified net value represented by these 796 searchable commercial and multi-residential records.

Why make it searchable?

The records were already public. They were not accessible in the ordinary sense of that word. A bulk CSV behind a county search page can satisfy the letter of public access while remaining invisible to most residents.

Making the file searchable changes no one’s tax status and proves no policy point. It lets a resident type an address, see the source values, inspect the assumptions behind a calculated comparison, and open the original county website. That is the job: turn a public file into a public record people can actually use.

References

1. Polk County Assessor — Commercial Inventory for Polk County
2. Iowa Legislature — Iowa Code Chapter 427, Property Exempt from Taxation
3. City of Des Moines — Research and Budget

Editorial disclosure

This article was researched and drafted with AI assistance, then checked against the cited public records. The data transformations and arithmetic are documented on our Methodology [blocked] page. AI does not decide whether a property qualifies for an exemption; that authority belongs to the Polk County Assessor and Iowa tax authorities.