French insurer AXA real estate investment arm briefly put the 62-storey building, which will be the tallest in the so-called Square Mile area, on ice after Britain's vote to leave the European Union in 2016, but resumed work later that year.

The building at 22 Bishopsgate, which analysts estimate will cost more than 1 billion pounds to construct, is due to be completed in late 2019, AXA IM - Real Assets said in a statement.

The firm is co-investing in the building, which industry sources said is considered a bet on London's real estate market after Brexit, with Singapore's Temasek Holdings and Canada's Public Sector Pension Investment Board, according to a source familiar with the matter.

A spokesman for the company declined to comment.

Hiscox has taken around 7,000 square meters over the 8th, 9th and 10th floors, with an option for further space, on a lease expiring in 2037, AXA IM said. It did not give financial details of the transaction.

Harry Badham, UK development director for AXA IM - Real Assets, said the firm hoped to announce further tenants "in the near future".

CBRE and JLL acted for the Twentytwo building and BH2 acted for Hiscox, AXA IM said.

(Reporting by Carolyn Cohn in London and Esha Vaish in Stockholm; Editing by Kirsten Donovan)