(4) The human rights commission shall, upon the filing of a verified written complaint by any person, investigate the actions of any person, firm, partnership, association, trustee, or corporation alleged to have violated this section. The complaint shall be in the form prescribed by the commission. The commission may, upon its own motion, issue complaints and conduct investigations of alleged violations of this section. RCW 49.60.240 through 49.60.280 shall apply to complaints under this section.