<Tr> <Th_colspan="2"> Website </Th> </Tr> <Tr> <Td_colspan="2"> www.whitehouse.gov/1600/vp-residence </Td> </Tr> <P> Number One Observatory Circle is the official residence of the Vice President of the United States . </P> <P> Located on the northeast grounds of the U.S. Naval Observatory in Washington, D.C., the house was built in 1893 for its superintendent . The Chief of Naval Operations (CNO) liked the house so much that in 1923 he took over the house for himself . It remained the residence of the CNO until 1974, when Congress authorized its transformation to an official residence for the Vice President, though a temporary one . In fact, by law, it is still the "official temporary residence of the Vice President of the United States ." The 1974 congressional authorization covered the cost of refurbishment and furnishing the house . </P>

What is the official residence of the vice president of the united states