Wis. Stat. § 67.25
Any proceedings by a city prior to October 4, 1959 for the issuance of general obligation bonds as authorized by s. 66.1333(13) in effect at the time of such proceedings, to provide financial assistance to blight elimination, slum clearance, redevelopment and urban renewal programs and projects being carried out under s. 66.1331, 66.1333 or 66.1337 may be continued under this chapter and, notwithstanding lack of power in the city to issue bonds under this chapter at the time of the adoption of an initial resolution or referendum of the electors approving such bonds, such proceedings are hereby validated, ratified, approved and confirmed, and any bonds authorized prior to or after October 4, 1959 as a result of the proceedings are and shall be binding, valid and enforceable obligations of the city, and the city may levy taxes without limitation for the payment thereof as provided in s. 67.035.
Wis. Stat. § 67.25