The site was then vacant until 1996 as various re-development plans led by Mitsubishi Estate failed to materialize; at one time the building was designed to have over fifty floors.

Just at the foot of the Hie Shrine, the skyscraper overlooks both the Prime Minister of Japan's official residence (Sōri Kantei), across the street to the northeast, and the Diet Building.

To achieve the building's height while obeying floor area ratio limitations under local zoning laws, air rights were bought from the neighboring Hie Shrine.

Pagani, an Italian sports car manufacturer, authorized Japanese dealer is located in the Sanno Park Tower Annex.

[citation needed] The lower floors house Tokyo offices of several multinational corporations, such as Lazard,[4] Deutsche Bank,[5] DuPont, Cushman & Wakefield,[6] Philip Morris, Standard Chartered,[7] Munich Re,[8] Estée Lauder and Canonical.