This excerpt taken from the PAA 8-K filed Jun 12, 2006.
SECTION 2.1 Purchase.
(a) Closing Date. The closing of the transactions contemplated by this Section 2.1 (the Closing) shall take place at the offices of Baker Botts L.L.P. at 910 Louisiana Street, Houston, Texas 77002, on the date of the Merger, but immediately prior to the consummation of the Merger (such date the Closing Date).