Still there from what I can tell and what the website says:
Bertie Backus: 5171 S. Dakota Ave. NE (near the Fort Totten Metro station on the Red, Yellow, and Green lines)
The first location provided by the DC Council in 2009 is the renovated Backus school - home to UDC-CC's practical nursing, nursing assistant, and home health aide programs and the architectural engineering, fashion merchandising and construction management degree programs. Continued expansion is planned.
The Bertie Backus location is listed as Building 54 in the course catalog and course guides.