0001193125-08-120918 424B7 2 20080522 20080522 Digital Realty Trust, Inc. 0001297996 6798 000000000 MD 1231 424B7 33 333-142396 08855259 560 MISSION STREET SUITE 2900 SAN FRANCISCO CA 94105 (415)738-6500 560 MISSION STREET SUITE 2900 SAN FRANCISCO CA 94105 424B7 1 d424b7.htm PROSPECTUS SUPPLEMENT NO. 12 GRAPHIC 2 g57276g33r18.jpg GRAPHIC