NEW YORK--(BUSINESS WIRE)--Fitch Ratings assigns a rating of 'BB+' to Digital Realty Trust's (NYSE: DLR) proposed Series I cumulative redeemable preferred stock issuance. The company expects to use to the net proceeds to fund a portion of the $1.9 billion acquisition of Telx announced last month. KEY RATING DRIVERS The rating reflects that while the acquisition of Telx moderately increases leverage in the near term, Fitch expects the company's metrics to improve in-line with longer-term histori