In addition to the tax authorized in connection with the annual budget and with the issuance of bonds, the voters in any merged area may at any regular election vote a special tax for a period not to exceed five years for the purchase of grounds, purchase or construction of buildings, purchase of equipment, and for the purpose of maintaining, remodeling, improving, or expanding the hospital area. Such a tax shall not exceed one-fourth of the maximum levy of each political subdivision as set out in the published order of merger, but the total tax levy for annual budget, bonds, and special purposes shall not exceed the maximum levy as proposed in the published order of merger.