| TR-1: NOTIFICATION OF MAJOR INTEREST 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 tick the appropriate box or boxes): | ||
| 
 An acquisition or disposal of voting rights | 
 | |
| 
 An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached |  | |
| 
 An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments |  | |
| 
 An event changing the breakdown of voting rights |  | |
| 
 Other (please specify): | 
 |  | 
| 3. Full name of person(s) subject to the notification obligation: 
 | 
 | 
| 4. Full name of shareholder(s) (if different from 3.): 
 | 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: 
 | 
 | 
| 6. Date on which issuer notified: 
 | December 6th, 2010 | 
| 7. Threshold(s) that is/are crossed or reached: 
 | Above 7.0% of voting rights | 
| 8. Notified details: | |||||||
| A: Voting rights attached to shares 
 | |||||||
| Class/type of 
 | Situation previous | Resulting situation after the triggering transaction | |||||
| Number | Number | Number | Number of voting | % of voting rights | |||
| Direct | Direct | Indirect | Direct | Indirect | |||
| 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
| 
 | |||||||
| B: Qualifying Financial Instruments | ||||
| Resulting situation after the triggering transaction 
 | ||||
| Type of financial | Expiration | Exercise/ | Number of voting 
 | % of voting | 
| 
 |  |  |  |  | 
| C: Financial Instruments with similar economic effect to Qualifying Financial Instruments | ||||||
| Resulting situation after the triggering transaction 
 | ||||||
| Type of financial | Exercise | Expiration | Exercise/ | Number of voting | % of voting rights 
 | |
| N/A |  |  |  |  | Nominal | Delta 
 | 
|  |  | |||||
| Total (A+B+C) 
 | |
| Number of voting rights | Percentage of voting rights | 
| 
 | 
 | 
| 9. Chain of controlled undertakings through which the voting rights and/or the | 
| 
 CSE is the controlled undertaking of CSI and holds 1,578,535 voting rights. This is an indirect holding of less than 3%. 
 CSCM is the controlled undertaking of CSI and holds 20,345,717 voting rights.  This is an indirect holding of less than 5%. 
 | 
| Proxy Voting: 
 | |
| 10. Name of the proxy holder: 
 | N/A | 
| 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 |