...SAN FRANCISCO (S&P Global Ratings) May 4, 2017--S&P Global Ratings assigned its '##' long-term rating to San Francisco City & County, Calif.'s 2017 certificates of participation (COPs), issued for the HOPE SF and Moscone Center Expansion projects. At the same time, S&P Global Ratings affirmed its '##+' long-term rating on the city and county's general obligation (GO) bonds, its '##' long-term rating and underlying rating (SPUR) on the city and county's appropriation debt outstanding, and its '###/A-1+' joint-support rating on the city and county's 2008 variable-rate lease revenue obligations. The outlook, where applicable, is stable. "Our ratings reflect our view of the city and county's very strong economy and budgetary flexibility," said S&P Global Ratings credit analyst Sarah Sullivant. The stable outlook reflects our expectation that the city and county's very strong economy and very strong budgetary flexibility will be maintained over the two-year outlook horizon, despite budgetary...