Ivanho茅 Cambridge is buying a US office portfolio in a joint venture with Callahan Capital Partners.

The property unit of public pension fund Caisse de D茅p么t et Placement du Qu茅bec and Chicago-based Callahan are buying four assets from Beacon Capital Partners.

The joint venture is investing $225m (鈧204m) in the Channel Center in Boston, and 17th Street in Denver鈥檚 central business district.

Arthur Lloyd, executive vice-president for offices in North America at Ivanho茅 Cambridge, said the investor had acquired well-located, high-quality office properties in key US cities.

The companies are also under contract to buy 180 North LaSalle Street in Chicago鈥檚 central business district, as well as the remaining 51% interest in 330 Hudson Street in New York鈥檚 Manhattan district.

The latter will give the joint venture full ownership of the property a 49% stake in the asset.