SAN FRANCISCO (Standard&Poor's) Sept. 19, 2014--Standard&Poor's Ratings Services assigned its 'AAA' long-term rating to the Massachusetts Institute of Technology's (MIT) approximately $525 million series D1 and D2 taxable general obligation (GO) bonds. In addition, Standard&Poor's affirmed its 'AAA' long-term rating and 'AAA/A-1+' rating on MIT's outstanding debt, some of which was issued by the Massachusetts Development Finance Agency (formerly known as the Massachusetts Health&Educational Facilities Authority). The outlook is stable. "The 'AAA' rating reflects our view of MIT's substantial endowment, incredible demand for its programs, growth in research, and consistently strong operating performance," said Standard&Poor's credit analyst Jessica Matsumori. "This offsets our view of the Institute's lower-than-average financial resource ratios