UNDERWRITING AGREEMENT Dated as of May 9, 2006 among SIMON PROPERTY GROUP, L.P. and MERRILL LYNCH & CO. MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED and BANC OF AMERICA SECURITIES LLC and DEUTSCHE BANK SECURITIES INC.Underwriting Agreement • May 12th, 2006 • Simon Property Group L P /De/ • Real estate investment trusts • New York
