Digital Realty's $7.8 billion acquisition of D.C.-based data center developer DuPont Fabros Technology has closed. The all-stock deal was first announced in June. As a result of it, DuPont Fabros (NYSE: DFT), with its portfolio of 12 data centers concentrated in Northern Virginia, Chicago and Silicon Valley, is now a wholly owned subsidiary of San Francisco-based Digital Realty (NYSE: DLR). "This highly strategic and complementary transaction further expands our product offering, and solidifies...