NEW YORK (Standard&Poor's CreditWire) Feb. 24, 2000--Standard&Poor's today assigned its triple-'A' rating to Plano, Texas' $24.33 million GO bonds series 2000 dated Feb. 15, 2000, due Sept. 1, 2020. In addition, Standard&Poor's raised its rating on the city's $227.62 million GO bonds to triple-'A' from double-'A'-plus. The outlook is stable. The upgrade reflects: -- A diversified economic base with significant ongoing additional investment, -- Sustained strong assessed value (AV) growth enhanced by the city's highly desirable location 20 miles north of the Dallas MSA, -- Significantly above-average wealth and income levels, -- Conservative financial and debt management policies reflected in monthly expenditure and revenue reporting, -- Extremely strong general fund reserve levels augmented by