The property, known as 3 Minster Court, was built in the 1990s in a historic business district of London.
The Montreal-based real estate company, an arm of the Caisse de depot, says the 170-million pound acquisition fits its goal of building a critical mass of high-quality assets in London.
The property being acquired is part of a multi-building complex developed by The Prudential. The neo-gothic property is leased to London Underwriting Centre.
Ivanhoe Cambridge holds about $42 billion of assets, mainly in Canada, the United States, Europe, Brazil, Mexico and Asia.
Note to readers: This is a corrected story. An earlier version misspelled Minster. The word million was also missing from the value of the deal in pounds.