(1) The licensed business premises of nonhouse-banked, Class F, and house-banked card rooms may not be adjacent to each other unless:

(a) Each is a fully separate and distinct licensed business premises; and

(b) There is a solid wall, with no internal access, between the two premises; and

(c) Each licensed business premises must operate as an independent commercial stimulant as defined in RCW 9.46.0217.

(2) Subsection (1) of this section does not apply to nonhouse-banked, Class F, and house-banked card room physical locations that have any of the features listed in subsection (1) of this section and were licensed as of July 1, 2018.

(3) Adjacent card rooms must post signs at each entrance that is accessible by the public to clearly notify customers of the licensed business premises' identity.