25 Canada Square (Citigroup Tower) (London)

Citigroup Centre, also known as Citi Centre, is a building complex in London. It is the EMEA headquarters of financial services firm Citi, located in Canary Wharf in the city's Docklands. The centre provides for 170,000m² of floor space across two merged buildings - 33 Canada Square (known as "CGC1") and 25 Canada Square (known as "CGC2"), and houses the bulk of Citi's UK employee base. Together, both buildings form the Citigroup Centre complex.

33 Canada Square, or Citigroup Centre 1, is the smaller of the two buildings in the complex, designed by Norman Foster and completed in 1999, two years before its neighbour. At 105 metres (344 ft) tall, the building is made up of eighteen floors, all of which are adjoined to their equivalent floors in 25 Canada Square. The building is owned by Citigroup, and was built before the completion of the Jubilee Line extension in late 1999.

In contrast, 25 Canada Square, or Citigroup Centre 2, stands at 200 metres (656 ft) and, alongside HSBC Tower (with which it was built in tandem), is the joint 2nd-tallest building in the United Kingdom (behind One Canada Square). Designed by César Pelli & Associates, construction of the 45-storey tower - undertaken by Canary Wharf Contractors - began in 1998 and was completed in 2001, with Citigroup leasing the building from the outset. The building was bought by RBS in 2004 along with 5 Canada Square (leased to Bank of America) for $1.12 billion. Subsequently, on 2 July 2007, CGC2 was individually sold to a joint venture between Quinlan Private and PropInvest for £1 billion (US$2 billion). Citigroup pay £46.5 million a year in rent for the tower, generating a yield of 4.6% to the owners.

In addition to main entrances from both Canada Square and Upper Bank Street, Citigroup Centre is also accessible via underground walkways from Canada Place shopping mall and Canary Wharf London Underground station - served by the Jubilee Line. The Centre is also close to DLR stations Canary Wharf and Heron Quays, which provide connections with the City, London City Airport and surrounding areas.