Any business improvement district created by a municipality may embrace two or more separate property areas. A business improvement district must include all properties which in the judgment of the governing body, after consultation with the city auditor or city auditor’s designee planning the improvement, will be benefited by the creation of all or a portion of the business improvement project. A district may be created without uniformity among the types, items, or quantities of work and materials to be used at particular locations throughout the district. The jurisdiction of a municipality to make, finance, and assess the cost of any improvement project may not be impaired by any lack of commonness, unity, or singleness of the location, purpose, or character of the improvement, or by the fact that any one or more of the properties included in the district is subsequently determined not to be benefited by the improvement, or by a particular portion of the improvement. Upon receipt of a petition signed by the owners of three-fourths of the area to be added to a business improvement district in which an improvement is proposed or created, the governing body may enlarge the district. Any district created under this chapter shall include only property devoted, in whole or in part, to commercial or business use.