The surrounding area converted into a broad plaza extending into a walkway toward the Imperial Palace, with space for bus and taxi ranks.
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Yoshimura's later works include the Tikotin Museum of Japanese Art (1959) in Haifa, Tokyo Imperial Palace (1968), Japan House (with George G. Shimamoto of Kelly & Gruzen, 1969–71) in New York City, the East and West Wings of the Nara National Museum (1972) and the Royal Norwegian Embassy (1977) in Tokyo.
The line is named after the west gate of the Imperial Palace (Hanzōmon), which in turn is named after 16th century samurai Hattori Hanzō, who was important to the founding of the shogunate which built the palace.