Great Portland Estates PLC 27 October 2006 Great Portland Estates plc ("GPE") Rule 2.10 announcement For the purposes of Rule 2.10 of the City Code on Takeovers and Mergers and following the conversion of £500,000 5.25% convertible bonds 2008, GPE's current issued share capital consists of 163,739,645 ordinary shares of 12.5p each and £53,579,000 outstanding of 5.25% convertible bonds 2008. The International Securities Identification Number for GPE ordinary shares is GB00B01FLL16 and for GPE 5.25% convertible bonds 2008 is GB0002479938 (for registered bonds) and XS0084560209 (for bearer bonds). Contacts: Great Portland Estates plc Desna Martin Company Secretary 020 7647 3093 Finsbury Gordon Simpson 020 7251 3801 This information is provided by RNS The company news service from the London Stock Exchange