Iowa Code § 28E.41
1. A county, city, fire district, or school district, which has areas within its boundaries which overlap areas within the boundaries of another county, city, fire district, or school district, or whose boundaries are contiguous with another county, city, fire district, or school district, may execute an agreement pursuant to this section for the joint construction or acquisition, furnishing, operation, and maintenance of a public building or buildings for their common use. Noncontiguous cities located within the same county, or cities located in contiguous counties, may also execute an agreement for the joint construction or acquisition, furnishing, operation, and maintenance of a joint public building or buildings for their common use. Such an agreement regarding a joint public building may allow for, but is not limited to, any of the following:
3.
99 Acts, ch 145, §1