Iowa Admin. Code r. 701-73.4
A multipurpose building is a building which is used for other purposes in addition to being used for living accommodations. If a portion of a homestead property is utilized for business purposes, the property is considered to be a multipurpose building.
The portion of the property tax due or rent constituting property tax paid attributable to the homestead only is to be used in determining the allowable credit or reimbursement. This portion is to be calculated by determining the percentage of the homestead square footage to the square footage of the entire multipurpose structure. This percentage is then to be applied to the property tax due in the current fiscal year or rent constituting property tax paid for the base year
This rule is intended to implement Iowa Code section 42517(8)..
Iowa Admin. Code r. 701-73.4