Original sentence: Level 17 remains vacant.Levels 18 to 23: Tenant floors (floors 21, 22 and 23 occupied by London 2012 - LOCOG, ODA and LDA Olympic Legacy Directorate and floors 18, 19 and 20 are occupied by BGC Partners)
Edited sentence: Levels 17 to 23: Tenant floors (floors 17, 21, 22 and 23 occupied by London 2012 - LOCOG, ODA, LDA Olympic Legacy Directorate and Olympic Security Directorate and floors 18, 19 and 20 are occupied by BGC Partners)