(Bloomberg) -- British Land Co. is planning to sell a portfolio of London buildings whose tenants include Facebook owner Meta Platforms Inc.

The London-based real estate investment trust has appointed an adviser to sell 10, 20 and 30 Brock Street which are valued at about £590 million ($668 million), people with knowledge of the sales plan said. The sales process is at an early stage and there’s no guarantee a deal will be agreed, the people added, asking not to be identified as the plans are private.

A spokeswoman for British Land declined to comment.

The UK’s biggest office REITs have been selling completed and fully leased properties and reinvesting the proceeds in new developments despite storm clouds hanging over the economy. That’s because they’re betting on a looming shortage of modern green buildings that will mean rents for the best space increase as more companies looking to achieve net-zero carbon commitments compete for a limited number of green offices. 

Rival Land Securities Group Plc sold 21 Moorfields in the City of London last month, the office that will house Deutsche Bank AG’s new London headquarters. Great Portland Estates Plc, another London office REIT, announced the sale of a nearly completed development on Finsbury Square earlier this month. 

British Land completed the largest of the trio of buildings at 10 Brock Street in 2013 and leased the building to companies including Facebook, Debenhams Plc and Manchester City Football Club. Facebook has since also taken over the space that was occupied by collapsed retailer Debenhams and now leases most of the building. The combined buildings span about 500,000 square feet (46,452 square meters) of space. 

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