The 'for sale' sign has been raised over Swiss Re's iconic London building, while Willis has finally sold its global headquarters at Ten Trinity Square.

Swiss Re's building at 30 St Mary Axe, known as the Gherkin, has been put on the market for £600m.

The sale could net Swiss Re £200m in profits. It is a sharp turnaround for the building which only two years ago was costing the reinsurer £35,000 a day in lost rental income.

It is understood that more than 20 overseas investors have expressed an interest in buying the building, including the Abu Dhabi royal family.

Meanwhile, US developer Thomas Enterprises has bought the Willis' building. Ten Trinity Square will become a prestigious hotel.

The broker will occupy a building currently under construction in Lime Street.