Great Portland Estates PLC 23 October 2006 Letter to: Great Portland Estates Plc Dated: 18 October 2006 Companies Act 1985 ("The Act") - Part VI I hereby inform you that as at 17-October-2006 Barclays PLC, through the legal entities listed on the attached schedule, has a notifiable interest in the capital of your Company of 4.2% 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 163,578,033 is the latest figure available to us. If this is incorrect please let me know. From: Geoff Smith Barclays PLC LEGAL ENTITY REPORT GREAT PORTLAND EST SEDOL: B01FLL1 As at 17 October 2006 Barclays PLC, through the legal entities listed below, had a notifiable interest in 6,863,075 ORD GBP0.125 representing 4.20% of the issued share capital of 163,578,033 units. Legal Entity Holding Percentage Held Barclays Global Investors Japan Ltd 16,145 .0099 Barclays Life Assurance Co Ltd 190,782 .1166 Barclays Global Investors Ltd 1,651,435 1.0096 Barclays Bank Trust Company Ltd 4,320 .0026 Barclays Capital Securities Ltd 1,533,811 .9377 Barclays Global Fund Advisors 1,481,467 .9057 Barclays Global Investors Australia Ltd 14,186 .0087 Barclays Global Investors Canada Ltd 11,955 .0073 Gerrard Ltd 111,576 .0682 Barclays Global Investors, N.A. 1,086,743 .6644 Barclays Global Investors Japan Trust & Banking 193,808 .1185 Barclays Capital Inc 566,847 .3465 Group Holding 6,863,075 4.1957 REGISTERED HOLDERS REPORT GREAT PORTLAND EST SEDOL: B01FLL1 As at 17 October 2006 Barclays PLC, through the registered holders listed below, had a notifiable interest in 6,863,075 ORD GBP0.125 representing 4.20% of the issued share capital of 163,578,033 units. Registered Holder Account Holding Designation BANK OF NEW YORK 12,160 BARCLAYS CAPITAL NOMINEES LIMITED 1,533,811 BARCLAYS CAPITAL NOMINEES LIMITED 566,847 BOISS NOMINEES LTD 4224361 153,424 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 Greig Middleton Nominees Limited (GMI) 3,000 INVESTORS BANK AND TRUST CO. 1,481,467 INVESTORS BANK AND TRUST CO. 984,894 JP MORGAN (BGI CUSTODY) 16331 41,560 JP MORGAN (BGI CUSTODY) 16341 91,295 JP MORGAN (BGI CUSTODY) 16400 1,264,026 JP MORGAN (BGI CUSTODY) 18409 151,972 JPMORGAN CHASE BANK 14,186 JPMORGAN CHASE BANK 5,327 JPMorgan Chase Bank 193,808 JPMorgan Chase Bank 11,341 Mellon Trust - US CUSTODIAN/ 7,179 Mitsui Asset 2,926 R C Greig Nominees Limited 94,260 R C Greig Nominees Limited GP1 1,757 R C Greig Nominees Limited SA1 3,120 R C Greig Nominees Limited a/c AK1 5,129 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 1,878 Total 6,863,075 This information is provided by RNS The company news service from the London Stock Exchange