Building 170 is a former electrical substation located by the Anacostia River in the Navy Yard neighborhood of Washington, D.C.. It is situated on the northwest corner of 3rd and Tingey Streets, Southeast, three blocks from the historic Washington Navy Yard. The industrial, two-story building was recently renovated and currently owned by the United States Department of Transportation. It is a contributing property to the Washington Navy Yard Annex Historic District, listed on the National Register of Historic Places in 2008.