RCW 23B.07.270

(1) The articles of incorporation may provide for a greater or lesser quorum, but not less than one-third of the votes entitled to be cast, for shareholders, or voting groups of shareholders, than is provided for by this title.

(2) The articles of incorporation may provide for a greater voting requirement for shareholders, or voting groups of shareholders, than is provided for by this title.

(3) Under RCW 23B.10.030, 23B.11.030, 23B.12.020, and 23B.14.020, the articles of incorporation may provide for a lesser vote than is otherwise prescribed in those sections or for a lesser vote by separate voting groups, so long as the vote provided for each voting group entitled to vote separately on the plan or transaction is not less than a majority of all the votes entitled to be cast on the plan or transaction by that voting group.

(5) An amendment to the articles of incorporation that adds, changes, or deletes a greater or lesser quorum or voting requirement for a merger, share exchange, sale of substantially all assets, or dissolution must be adopted by the same vote and voting groups as are required under the quorum and voting requirements then in effect for approval of the particular corporate action, or the quorum and voting requirements then in effect for amendments to articles of incorporation, whichever is greater.