Great Portland Estates PLC 11 October 2007 TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES (1). Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached: Great Portland Estates PLC 2. Reason for the notification (please state Yes/No): ( ) An acquisition or disposal of voting rights: (Yes) An acquisition or disposal of financial instruments which may result in the acquisition of shares already issued to which voting rights are attached: ( ) An event changing the breakdown of voting rights: ( ) Other (please specify) : ( ) 3. Full name of person(s) subject to the notification obligation: Cohen & Steers, Inc 4. Full name of shareholder(s) (if different from 3.): Cohen & Steers, Inc ("CSI") Cohen & Steers Capital Management, Inc ("CSCM") Cohen & Steers Europe S.A. ("CSE") 5. Date of the transaction and date on which the threshold is crossed or reached if different): October 8th, 2007 6. Date on which issuer notified: October 9th, 2007 7. Threshold(s) that is/are crossed or reached: 7% 8. Notified details: A: Voting rights attached to shares Class/type of shares Situation previous to if possible using the the Triggering ISIN CODE transaction Number of shares Number of voting Rights GB00B01FLL16 12,572,556 12,572,556 Resulting situation after the triggering transaction Class/type of shares Number of shares Number of voting rights % of voting rights if possible using the ISIN CODE Direct Indirect Direct Indirect Direct Indirect GB00B01FLL16 12,852,556 7% B: Financial Instruments Resulting situation after the triggering transaction Type of Expiration Date Exercise/Conversion Number of voting % of voting financial Period/ Date rights that may be rights instrument acquired if the instrument is exercised/ converted. Nill Total (A+B) Number of voting rights % of voting rights 12,852,556 7% 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable: CSE is the controlled undertaking of CSI and holds 1,291,872 voting rights. This is an indirect holding of less than 3%. CSCM is the controlled undertaking of CSI and holds 11,560,684 voting rights. This is an indirect holding of more than 5%. Proxy Voting: 10. Name of the proxy holder: 11. Number of voting rights proxy holder will cease to hold: 12. Date on which proxy holder will cease to hold voting rights: 13. Additional information: 14. Contact name: Lisa D. Phelan 15. Contact telephone number: 00 1 212-4469160 This information is provided by RNS The company news service from the London Stock Exchange