In the case of a proposed marijuana facility that is part of a larger structure, such as an office building or strip mall, the distance between the proposed marijuana facility and the existing marijuana facility, elementary school, secondary school, child day-care facility, or church shall be measured from the property line of the existing marijuana facility, elementary school, secondary school, child day-care facility, or church to the proposed marijuana facility's entrance or exit closest in proximity to the existing marijuana facility, elementary school, secondary school, child day-care facility, or church. If the existing marijuana facility, elementary school, secondary school, child day-care facility, or church is part of a larger structure, such as an office building or strip mall, the distance shall be measured to the entrance or exit of the existing marijuana facility, elementary school, secondary school, child day-care facility, or church closest in proximity to the proposed marijuana facility.