It said today it had instructed Knight Frank and Cushman & Wakefield to market floors 22 to 24 totalling 87,000 sq ft. The quoting rent has not been revealed. The space will be available for occupation by the middle of next year.
The decision follows the deal completed last month when Transport for London agreed to sublet 116,000 sq ft at Citi's building to house its Crossrail team.
A Citi spokesman said it was part of its ongoing effort to maximize its real estate use.
Other occupiers of the tower include SunGard, Instinet, Think London, Hatfield Philips, Wells Fargo, AEG, Munich Re and MWB.
