Clearing House Advisory Notices
To Clearing Member Firms
From CME Clearing
Subject CORPORATE EVENT: Archstone-Smith Trust (ASN) Acceleration of Maturity Date 10/24/07
Notice Date 2007-10-23
Notice Number 07-256
Effective Date 2007-10-24

On August 21, 2007, Shareholders of Archstone-Smith Trust (“ASN”) voted concerning the proposed merger with a subsidiary of River Holding, LP, an entity jointly controlled by affiliates of Tishman Speyer Real Estate Venture VII, L.P. and Lehman Brothers Holdings Inc. The merger was approved and subsequently consummated on October 5, 2007. As a result, each existing ASN Common Share will be converted into the right to receive $60.75 net cash per share.

On October 8, 2007 all ASN1C Security Futures were adjusted to deliver $6,075.00 ($60.75 x 100).  The maturity date for all ASN1C Security Futures will be accelerated to Wednesday October 24, 2007. The final settlement price for all ASN1C contracts will be $6,075.00.  Trading in ASN1C futures ceased at the close of business on Friday, October 5, 2007. This corporate event will be coordinated with the Options Clearing Corporation.

For the full text of this advisory . . .