In 2001, the New York City Landmarks Preservation Commission designated the original portion of 1 Wall Street as an official city landmark. The designation only included the exterior of the original building and did not extend to the southern annex. The lobby interior was not given a separate interior-landmark designation because such designations at the time were reserved for publicly accessible spaces. Since the lobby could only be used by BNY Mellon workers at the time of the exterior designation, it was legally considered to be closed to the public. As a result of the landmark designation's limited scope, most of the improvements made in the 2010s condominium conversion, such as the glass retail addition, were made to the annex. Changes to designated landmarks required the commission's approval, but the annex was out of the commission's scope. Additionally, in 2007, the building was designated as a contributing property to the Wall Street Historic District, a National Register of Historic Places district.