...S&P Global Ratings assigned its '###' rating to the City of Austin, Texas' $87.2 million series 2020 public improvement and refunding bonds, $110.4 million series 2020 certificates of obligation, $23.4 million series 2020 public property finance contractual obligations, and $49.9 million series 2020 taxable public improvement and refunding bonds. At the same time, S&P Global Ratings affirmed its '###' rating on the city's general obligation (GO) debt and certificates of obligation outstanding. The outlook is stable. In addition, S&P Global Ratings affirmed its '##+' rating on Mueller Local Government Corp.'s appropriation debt, supported by the city. The outlook is stable. The certificates of obligation, public improvement bonds, and public property finance contractual obligations are payable from an ad valorem tax, levied within the limits prescribed by law, on all taxable property within the city. The maximum allowable ad valorem tax rate in Texas for cities is $2.50 per $100 of assessed...