Great Portland Estates PLC 20 November 2006 Letter to: Great Portland Estates Plc Dated: 14 November 2006 Companies Act 1985 ("The Act") - Part VI I hereby inform you that as at 13-November-06 Barclays PLC, through the legal entities listed on the attached schedule, has a notifiable interest in the capital of your Company of 4.00% Details of this interest, together with a breakdown between registered holders (as required by Section 202(3) of the Act), are enclosed. The issued capital of 163,981,580 is the latest figure available to us. From: Geoff Smith Barclays PLC LEGAL ENTITY REPORT GREAT PORTLAND EST SEDOL: B01FLL1 As at 13 November 2006 Barclays PLC, through the legal entities listed below, had a notifiable interest in 6,559,892 ORD GBP0.125 representing 4.00% of the issued share capital of 163,981,580 units. Legal Entity Holding Percentage Held Barclays Life Assurance Co Ltd 190,782 .1163 Barclays Global Investors Japan Ltd 16,693 .0102 Barclays Global Investors Ltd 1,634,509 .9968 Barclays Bank Trust Company Ltd 4,320 .0026 Barclays Capital Inc 366,847 .2237 Barclays Global Investors, N.A. 1,082,741 .6603 Barclays Global Investors Japan Trust & Banking 194,730 .1188 Barclays Global Investors Australia Ltd 14,186 .0087 Barclays Global Investors Canada Ltd 11,955 .0073 Barclays Global Fund Advisors 1,494,466 .9114 Gerrard Ltd 110,536 .0674 Barclays Capital Securities Ltd 1,438,127 .8770 Group Holding 6,559,892 4.0005 REGISTERED HOLDERS REPORT GREAT PORTLAND EST SEDOL: B01FLL1 As at 13 November 2006 Barclays PLC, through the registered holders listed below, had a notifiable interest in 6,559,892 ORD GBP0.125 representing 4.00% of the issued share capital of 163,981,580 units. Registered Holder Account Holding Designation BANK OF IRELAND 429084 4,338 BANK OF NEW YORK 12,160 BARCLAYS CAPITAL NOMINEES LIMITED 366,847 BARCLAYS CAPITAL NOMINEES LIMITED 1,438,127 BOISS NOMINEES LTD 4224361 158,218 Barclays Global Investors Canada 11,955 Barclays Trust Co DMC69 C 000000000000000000 4,320 CHASE NOMINEES LTD 16376 82,013 CHASE NOMINEES LTD 28270 57,927 INVESTORS BANK AND TRUST CO. 982,240 INVESTORS BANK AND TRUST CO. 1,494,466 JP MORGAN (BGI CUSTODY) 16331 41,560 JP MORGAN (BGI CUSTODY) 16341 91,295 JP MORGAN (BGI CUSTODY) 16400 1,237,968 JP MORGAN (BGI CUSTODY) 18409 151,972 JPMORGAN CHASE BANK 14,186 JPMORGAN CHASE BANK 5,327 JPMorgan Chase Bank 194,730 JPMorgan Chase Bank 11,341 Mellon Trust - US CUSTODIAN / 5,831 Mitsui Asset 2,926 R C Greig Nominees Limited 97,660 R C Greig Nominees Limited GP1 1,757 R C Greig Nominees Limited SA1 3,120 R C Greig Nominees Limited a/c AK1 3,689 R C Greig Nominees Limited a/c BL1 3,110 R C Greig Nominees Limited a/c CM1 1,200 STATE STREET BOSTON 77,183 Trust & Custody Service Bank 2,426 Total 6,559,892 This information is provided by RNS The company news service from the London Stock Exchange