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This paper is concerned with maximal pole placement solutions for the Almost Disturbance Decoupling Problem (ADDP) by static state feedback. It is shown that, when solving ADDP by means of high gain state feedback, always are present some fixed finite poles and poles close to infinity in the closed loop system, which can not be freely assigned. A class of "optimal" geometric subspaces with which maximal complementary pole placement can be achieved is characterized. A reliable constructiondoi:10.1109/acc.2009.5160075 dblp:conf/amcc/ZouM09 fatcat:enw3raee2becbmcvqxsci27jfa