Great Portland Estates PLC 19 October 2006 BLOCK LISTING SIX MONTHLY RETURN INFORMATION PROVIDED ON THIS FORM MUST BE TYPED OR PRINTED ELECTRONICALLY. To: The FSA Date: 19 October 2006 Name of applicant: Great Portland Estates plc Name of scheme: Conversion of 5.25% Convertible Bonds 2008 Period of return: From: 17 October 2006 To: 19 October 2006 Balance under scheme from previous return: 17,606,456 The amount by which the block scheme has - been increased, if the scheme has been increased since the date of the last return; Number of securities issued/allotted under 322 scheme during period: Balance under scheme not yet issued/ 17,606,134 allotted at end of period Number and class of securities originally 18,709,678 Ordinary 12.5p shares listed and the date of admission 7 October 2005 Total number of securities in issue at 163,578,355 the end of the period Name of contact: Desna Martin Address of contact: 33 Cavendish Square London W1G 0PW Telephone number of contact: 0207 647 3093 SIGNED BY Company secretary GREAT PORTLAND ESTATES plc Name of applicant If you knowingly or recklessly give false or misleading information yon may be liable to prosecution. This information is provided by RNS The company news service from the London Stock Exchange