Great Portland Estates PLC 06 April 2006 BLOCKLISTING SIX MONTHLY RETURN INFORMATION PROVIDED ON THIS FORM MUST BE TYPED OR PRINTED ELECTRONICALLY. To: The FSA Date: 6 April 2006 1. Name of applicant: Great Portland Estates plc 2. Name of scheme: Conversion of 5.25% Convertible Bonds 2008 3. Period of return: From: 7 October 2005 To: 6 April 2006 4. Balance under scheme from previous return: 18,709,678 5. The amount by which the block scheme has been increased, if the scheme has been increased since the date of the last return: - 6. Number of securities issued/allotted under scheme during period: 707,095 7. Balance under scheme not yet issued / allotted at end of period: 18,002,583 8. Number and class of securities originally listed and the date of admission: 18,709,678 Ordinary 12.5p shares 7 October 2005 9. Total number of securities in issue at the end of the period: 163,181,906 Name of contact: Desna Martin Address of contact: 33 Cavendish Square London W1G OPW Telephone number of contact: 0207 647 3093 Signed by: D Martin Company secretary for and on behalf of Name of applicant: Great Portland Estates Plc If you knowingly or recklessly give false or misleading information you may be liable to prosecution. This information is provided by RNS The company news service from the London Stock Exchange