I-1 - Preliminary Official Statement - GO Bond 2025

*(Form of Bond Counsel Opinion) We hereby certify that we have examined certified copies of the proceedings (the “Proceedings”) of the City Council of the City of Tiffin (the “Issuer”), in Johnson County, Iowa, passed preliminary to the issue by the Issuer of its General Obligation Corporate Purpose Bonds, Series 2025A (the “Bonds”) in the amount of $5,500,000, in the denomination of $5,000 each, or any integral multiple thereof, dated April 24, 2025, in evidence of the Issuer’s obligation under a certain loan agreement (the “Loan Agreement”), dated as of April 24, 2025. The Bonds mature on June 1 in each of the respective years and in the principal amounts and bear interest payable semiannually on June 1 and December 1 in each year, commencing December 1, 2025, at the respective rates as follows: Date Principal Interest Rate Date Principal Interest Rate 2026 $100,000 _____% 2034 $395,000 _____% 2027 $215,000 _____% 2035 $410,000 _____% 2028 $320,000 _____% 2036 $425,000 _____% 2029 $330,000 _____% 2037 $440,000 _____% 2030 $340,000 _____% 2038 $455,000 _____% 2031 $355,000 _____% 2039 $475,000 _____% 2032 $365,000 _____% 2040 $495,000 _____% 2033 $380,000 _____% Principal of the Bonds maturing in the years 2033 through 2040, inclusive, is subject to optional redemption prior to maturity on June 1, 2032, or on any date thereafter on terms of par plus accrued interest. Based upon our examination, we are of the opinion, as of the date hereof, that: 1. The Proceedings show lawful authority for such issue under the laws of the State of Iowa. 2. The Bonds and the Loan Agreement are valid and binding general obligations of the Issuer. 3. All taxable property within the corporate boundaries of the Issuer is subject to the levy of taxes to pay the principal of and interest on the Bonds without constitutional or statutory limitation as to rate or amount. 4. The interest on the Bonds (including any original issue discount properly allocable to an owner thereof) is excluded from gross income for federal income tax purposes