東京国際フォーラム.

HFF and
happy weekend:)
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Interior, connecting walkways.

One of its halls seats 5,000. In addition to seven other halls, it includes exhibition space, a lobby, restaurants, shops, and other facilities.
Standing between Tokyo Station and Yūrakuchō Station, its address is in Marunouchi, Chiyoda, on the site formerly occupied by Tokyo City Hall (before it moved to the Tokyo Metropolitan Government Building in 1991).