Insurance giant Swiss Re has sold its iconic skyscraper in the heart of the City of London - known as the Gherkin.
The 'Gherkin' is one of London's most distinctive sights
German property firm IVG Immobilien and UK investment firm Evans Randall bought the building in the heart of the UK financial district for £600m ($1.2bn).
Swiss Re said it would stay on in the building as a tenant until 2031, holding 50% of the office space.
Further reports claim HSBC may sell and lease back its Canary Wharf tower block - a deal that could net more than £1bn.
The bank would then look to rent back the 45-storey building, at 8 Canada Square, for about £45m a year, a report in the Hong Kong Economic Times said.
"Everything is under discussion at the moment and no figures have been confirmed," said HSBC spokeswoman Vinh Tran.
The Gherkin was built in 2003, at a cost of £138m and is one of the capital's most distinctive structures.
Officially called 30 St Mary Axe, it was built on the site of the bombed Baltic Exchange in the heart of the financial district.
Designed by Lord Foster it maximises daylight and natural ventilation so that it uses half the energy typically required by an office block.
Each floor rotates five degrees from the last and the only curved piece of glass on the entire building is the very top piece.
As winner of the Royal Institute of British Architects (RIBA) Stirling Prize in 2004 it was described as "elegant and impressive".