...TOKYO (Standard & Poor's) May 13, 2015--Standard & Poor's Ratings Services today said that it has assigned its '##-' debt rating to Tokyo Metropolitan Government's (TMG; ##-/Negative/--) US$1 billion, 2.125% dollar-denominated senior unsecured bonds due May 19, 2020. The strength of TMG's economy compares well with that of international peers, and TMG is at the heart of Japan's economy and attracts widespread economic, political, and other value-added activities that support a diverse industrial base and high residential income. TMG has strong tax revenues that enable it to stand independent of the central government's vertical fiscal adjustments. We evaluate TMG's modifiable revenues (including taxes, fees, and rates but excluding central government transfers) as the strongest of any local or regional government in Japan. TMG maintains sufficient liquidity, which also supports the ratings. The sovereign ratings on Japan (##-/Negative/A-1+) constrain the ratings on TMG. Although TMG does...