A consortium of international property investors including Abu Dhabi Investment Council have agreed to buy a prominent Tokyo office building for $1 billion. It will be Japan's biggest property investment including foreign investors since the 2008-09 global financial crisis. The group, led by property investor Asia Pacific Land, includes Abu Dhabi Investment Council, Japan's Secured Capital Investment Management Co and C.V. Starr & Co Inc, which is run by the billionaire former chief executive of American International Group - Reuters is reporting.