Ind. Code § 6-1.1-17-7

Sec. 7. If the boundaries of a political subdivision cross one (1) or more county lines, the budget, tax levy, and tax rate fixed by the political subdivision shall be filed with the county auditor of each affected county in the manner prescribed in section 5 or 5.6 of this chapter. The board of tax adjustment of the county which contains the largest portion of the value of property taxable by the political subdivision, as determined from the abstracts of taxable values last filed with the auditor of state, has jurisdiction over the budget, tax rate, and tax levy to the same extent as if the property taxable by the political subdivision were wholly within the county. The secretary of the county board of tax adjustment shall notify the county auditor of each affected county of the action of the board. Appeals from actions of the county board of tax adjustment may be initiated in any affected county.