Florida Main Street Program and Historic Preservation Tax Credits; Specifies eligibility requirements for receiving specified tax credits for taxpayers that rehabilitate certified historic structures; specifies requirements for DOR relating to applications & credits; specifies requirements for such tax credits; authorizes carryforward, sale, & transfer of tax credits; provides limitation; revises order in which tax credits against corporate income tax credit or franchise tax are applied; revises order in which tax credits & deductions against insurance premium tax are applied.