Standard&Poor's Ratings Services affirmed its 'AA-/A-1+' rating on Rochester, Minn.'s (Mayo Clinic) hospitality variable-rate demand obligation series 2001B and 2008B, due to their bank facilities being extended to Jan. 21, 2011, and Jan. 29, 2011, respectively. The long-term component of the rating is based on Mayo Clinic. The short-term component of the rating is based on liquidity facility provided by The Northern Trust Company. The stable outlook is based on the outlook of the obligor. USPF Criteria: Bank Liquidity Facilities, June 22, 2007