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Foster + Partners' London City Hall floods

Whoever becomes London Mayor could find themselves ankle deep in water when the winner is officially announced on Friday (2 May).

On Sunday morning (27 April), Foster + Partners’ City Hall building, Southwark – the original venue for the announcement of the election results – was flooded after a water main shattered in Tooley Street.

Around seven million litres of water burst out of the broken pipe close to Tower Bridge, causing the Greater London Authority (GLA) headquarters to close its doors.

It is still unclear when the building will reopen, but Foster + Partners has confirmed that it has not been called in to assess the damage.

Meanwhile, it is understood the GLA is now looking at an alternative venue for the electoral announcements.

The flood, which caused Guy’s and St Thomas’s Hospital NHS Trust to postpone 21 operations, also resulted in power loss to thousands of properties.

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