<P> The BIPM was created on 20 May 1875 , following the signing of the Metre Convention , a treaty among 51 nations ( as of August 2008 ) . It is based at the Pavillon de Breteuil in Sèvres , France , a 4.35 ha ( 10.7 - acre ) site ( originally 2.52 ha ( 6.2 acres ) ) granted to the Bureau by the French Government in 1876 , where it enjoys extraterritorial status , a status that was clarified by the French decree No 70 - 820 of 9 September 1970 . </P>
where is the bureau responsible for regulating the international system of measurement located
Pavillon de Breteuil in Sèvres , France