VNET [21Vianet] SC 13D: Joint Filing Agreement [Remainder of this page has
[Joint Filing Agreement [Remainder of this page has been intentionally left blank.] 28 Vector Holdco Pte. Ltd. William Christian Greer Nicholson Director BTO Vector Fund ESC (CYM) L.P. BTO Holdings (Cayman) - NQ Manager L.L.C., its general partner Blackstone Tactical Opportunities Management Associat]