Clifford Chance (CC) has edged a step closer to subletting out six floors of empty office space in its London headquarters, with Transport for London (TfL) in talks to take the space in a deal that could save the firm millions in rental income each year.

The transport body has put in an offer to take over roughly 220,000 sq ft of CC’s 10 Upper Bank Street building in Canary Wharf – equating to six of the tower’s 30 floors.