Opus 40 is added to the National Register of Historic Places — the United States federal government’s official list of districts, sites, buildings, structures and objects deemed worthy of preservation for their historical significance.

Authorized by the National Historic Preservation Act of 1966, the National Park Service’s National Register of Historic Places is part of a national program to coordinate and support public and private efforts to identify, evaluate, and protect America’s historic and archeological resources.

The NRoHP offers guidance on evaluating, documenting, and listing different types of historic places and helps qualified historic properties receive preservation benefits and incentives.