Hangar 61, one of the last remnants of Stapleton Airport, is a masterful, mid-century modernist structure with a dramatic form that resembles a cluster of pie slices but is actually a composition of fragmentary hyperbolic arches held in place by massive concrete anchors. Built to house Ideal Basic Cement Company's corporate plane, it's so stylish that it looks like James Bond could have used it. It was designed by Fisher and Fisher and Davis, a Denver firm that traced its origins to William Ellsworth Fisher, an architect responsible for several LoDo landmarks. The organization ultimately evolved into the Davis Partnership, which is currently collaborating with Daniel Libeskind on the Denver Art Museum's Hamilton Building. Despite its noble lineage, Hangar 61 is threatened with demolition: Its fate will be determined by the Denver City Council this spring.