Wash. Rev. Code § 25.10.756
(1) An organization other than a limited partnership may convert into a limited partnership, and a limited partnership may convert into another organization pursuant to this section and RCW 25.10.761 through 25.10.771 and a plan of conversion, if:
(2) A plan of conversion must be in a record and must include:
[ 2009 c 188 s 1102.]