NY -- Standard&Poor's CreditWire 12/30/98 – Standard&Poor's today assigned its single-'A'-minus underlying rating (SPUR) to Colorado Educational and Cultural Facilities Authority's revenue bonds series 1999 dated Jan. 1, 1999 due March 1, 2009, issued for the University of Denver also known as Colorado Seminary. The bonds are scheduled to sell Jan. 15, 1999, and are expected to receive a triple-'A' rating based on municipal bond insurance from AMBAC. At the same time, Standard&Poor's affirmed its single-'A'-minus rating on Denver City and County, Colo.'s outstanding revenue bonds series 1991 and its single-'A'-minus underlying rating (SPUR) on Colorado Postsecondary Educational Facilities Authority's refunding and improvement revenue bonds series 1997, both issued for the university. The underlying