This paper briefly reports on the structural design of the large (26 m×24 m) sashless glass ceiling that covers the entrance stairs of the underground shopping mall in front of Kawasaki Station, located in Kawasaki City, one of the largest satellite cities in Tokyo. The glass ceiling is totally suspended from an L-shaped gate composed of spatial truss frames. Because these structures were constructed in a heavy seismic zone, they were carefully designed to withstand well during earthquakes whose maximum ground acceleration reaches 350 cm/sec², yet use a minimum number of effective elements to maintain transparency of the structure. On March 11. 2011, the Great East Japan Earthquake hit this structure; however, none of the components including the glass panels were damaged.