The Smithsonian plans to open its first international exhibition space at a new cultural complex being developed at the former Olympic park in London, officials announced Tuesday.

The deal would mark the first time in the institution’s 168-year history that it would have a public presence outside the United States. It also would make the Smithsonian part of an elite group of museums — including the Guggenheim in New York and the Louvre in Paris — that have opened venues in other parts of the world.