I think Kokusai Nihombashi is the one that vacant.
They have a new tenent which only 15 people which occupied only 8th floor.
http://www.spower.jp/en/company.html
Kokusai Nihonbashi is a pretty large office property.
http://www.astrojapanproperty.com/aja-portfolio/properties/kokusai-nihombashi.aspx