NEW YORK--(BUSINESS WIRE)--Fitch Ratings has upgraded Walker & Dunlop, LLC's (Walker & Dunlop) commercial primary servicer rating to 'CPS2' from 'CPS2-'. The upgrade reflects a fully developed internal audit function, an integrated technology platform consolidated through a new data warehouse, as well as two new employee development programs to help strengthen the company's management bench. Rating positives also include the company's strong and stable management team, along with approp