NEW YORK--(BUSINESS WIRE)--Fitch Ratings has upgraded three and affirmed 13 classes of commercial mortgage pass-through certificates from TIAA Seasoned Commercial Mortgage Trust, series 2007-C4. Fitch has also revised the Rating Outlook on class E to Stable from Negative. A detailed list of rating actions follows at the end of this press release. KEY RATING DRIVERS The upgrades are primarily due to an increase in credit enhancement as a result of 45.2% principal paydown since Fitch's last ratin
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