16 Collyer Quay, formerly CALTEX HOUSE and Hitachi Tower,[5][2] is a 37-storey, 166 m (545 ft), skyscraper in the central business district of Singapore.

It is located on 16 Collyer Quay, in the zone of Raffles Place, near Chevron House, Change Alley,[6] Tung Centre, and The Arcade, all of which are roughly 100 metres away.

[10] In January 2011, NTUC Income acquired a 49 percent stake in Savu Investments, the holding company which owns the asset, from Goldman Sachs.

Its facade is expressed in three parts, which breaks the verticality of the 37-storey tower and creates a stepping down effect that matches with the height of its shorter neighbour, Tung Centre.

The bank lobby is lifted to the upper floors to create Change Alley on the first storey, a pedestrian thoroughfare lined with retail activities that is today, a well-used and vibrant space linking Raffles Place to Collyer Quay.