25 Canada Square, along with the neighbouring 33 Canada Square, make up the Citigroup Centre - a 170,000sq m (1.8m sq ft) office complex occupied by the Citigroup group of companies.

The building has entrances on Upper Bank Street and Canada Square, with underground floors linking in to both the Canada Place shopping mall and the Canary Wharf underground station.

25 Canada Square was built in tandem with 8 Canada Square. Both buildings are exactly the same height and simultaneously became the second tallest buildings in the United Kingdom upon reaching full height.

The two buildings in the Citigroup Centre are affectionately known as Oliver 1 and Oliver 2 by Canary Wharf employees. After the bank had leased 33 Canada Square, it returned to Canary Wharf and asked "can we have some more please?". 25 Canada Square was the result.