By Lars Mucklejohn Canary Wharf’s owners are reportedly in talks with third parties to sell a stake in its four underground shopping centres as the banking district’s office portfolio struggles with working from home trends. Canary Wharf Group (CWG), owned by private equity giant Brookfield and the state-owned Qatar Investment Authority, is holding discussions with outside investors interested in the retail assets, The Sunday Times reported. It is said that the talks could lead to CWG establishing a joint venture for the assets with a third party, or the group raising new debt against the shop…