Wash. Rev. Code § 59.20 § 59.20.080

(1) A landlord shall not terminate or fail to renew a tenancy of a tenant or the occupancy of an occupant, of whatever duration except for one or more of the following reasons:
(a) In accordance with RCW 59.20.045 (6), substantial violation, or repeated or periodic violations, of an enforceable rule of the mobile home park as established by the landlord at the inception of or during the tenancy or for violation of the tenant's duties as provided in RCW 59.20.140 . The tenant shall be given written notice to cease the rule violation immediately. The notice shall state that failure to cease the violation of the rule or any subsequent violation of that or any other rule shall result in termination of the tenancy, and that the tenant shall vacate the premises within 20 days: PROVIDED, That for a periodic violation the notice shall also specify that repetition of the same violation shall result in termination: PROVIDED FURTHER, That in the case of a violation of a "material change" in park rules with respect to pets, tenants with minor children living with them, or recreational facilities, the tenant shall be given written notice under this chapter of a six month period in which to comply or vacate;
(b) Nonpayment of rent or other charges specified in the rental agreement, upon 14 days written notice to pay rent and/or other charges or to vacate;
(c) Conviction of the tenant of a crime, commission of which threatens the health, safety, or welfare of the other mobile home park tenants. The tenant shall be given written notice of a 15-day period in which to vacate;
(d) Failure of the tenant to comply with local ordinances and state laws and regulations relating to mobile homes, manufactured homes, or park models or mobile home, manufactured homes, or park model living within a reasonable time after the tenant's receipt of notice of such noncompliance from the appropriate governmental agency;
(e) Change of land use of the mobile home park including, but not limited to, closure of the mobile home park or conversion to a use other than for mobile homes, manufactured homes, or park models or conversion of the mobile home park to a mobile home park cooperative or mobile home park subdivision. The landlord shall give the tenants two years' notice, in the form of a closure notice meeting the requirements of RCW 59.21.030 , in advance of the effective date of such change. The two-year closure notice requirement does not apply if:
(i) The mobile home park or manufactured housing community has been acquired for or is under imminent threat of condemnation;
(ii) The mobile home park or manufactured housing community is sold or transferred to a county in order to reduce conflicting residential uses near a military installation;
(iii) The mobile home park or manufactured housing community is sold to an eligible organization;
(iv) The landlord provides relocation assistance of at least $15,000 for a multisection home or of at least $10,000 for a single section home, establishes a simple, straightforward, and timely process for compensating the tenants for the loss of their homes and actually compensates the tenants for the loss of their homes, at the greater of 50 percent of their assessed market value in the tax year prior to the notice of closure being issued, or $5,000, at any point during the closure notice period and prior to a change of use or sale of the property. At such time as the compensation is paid, the tenant shall be given written notice of at least 12 months in which to vacate that includes department of commerce contact information, as provided by the department of commerce, identifying financial and technical assistance programs available to support eligible tenant relocation activities, and the tenant shall continue to pay rent for as much time as he or she remains in the mobile home park or manufactured housing community. Nothing in this subsection (1)(e)(iv) prevents a tenant from relocating his or her home out of the mobile home park or manufactured housing community pursuant to chapter 59.21 RCW. In the event that a home remains in the mobile home park or manufactured housing community after a tenant vacates, the landlord shall be responsible for its demolition or disposal. A landlord is still eligible for demolition and disposal costs pursuant to RCW 59.21.021 . Homeowners who receive payments or financial assistance from landlords as described in this subsection (1)(e)(iv) remain eligible to receive other state assistance for which they may be eligible including, but not limited to, relocation assistance funds pursuant to RCW 59.21.021 ; or
(v) The landlord provides relocation assistance of at least $15,000 for a multisection home and of at least $10,000 for a single section home at any point during the closure notice period and prior to a change of use or sale of the property. At such time as the assistance is paid, the tenant shall be given written notice of at least 18 months in which to vacate that includes department of commerce contact information, as provided by the department of commerce, identifying financial and technical assistance programs available to support eligible tenant relocation activities, and the tenant shall continue to pay rent for as much time as he or she remains in the mobile home park or manufactured housing community. Nothing in this subsection (1)(e)(v) prevents a tenant from relocating his or her home out of the mobile home park or manufactured housing community pursuant to chapter 59.21 RCW. In the event that a home remains in the mobile home park or manufactured housing community after a tenant vacates, the landlord shall be responsible for its demolition or disposal. A landlord is still eligible for demolition and disposal costs pursuant to RCW 59.21.021 . Homeowners who receive payments or financial assistance from landlords as described in this subsection (1)(e)(v) remain eligible to receive other state assistance for which they may be eligible including, but not limited to, relocation assistance funds pursuant to RCW 59.21.021 ;
(f) Engaging in "criminal activity." "Criminal activity" means a criminal act defined by statute or ordinance that threatens the health, safety, or welfare of the tenants. A park owner seeking to evict a tenant or occupant under this subsection need not produce evidence of a criminal conviction, even if the alleged misconduct constitutes a criminal offense. Notice from a law enforcement agency of criminal activity constitutes sufficient grounds, but not the only grounds, for an eviction under this subsection. Notification of the seizure of illegal drugs under RCW 59.20.155 is evidence of criminal activity and is grounds for an eviction under this subsection. The requirement that any tenant or occupant register as a sex offender under RCW 9A.44.130 is grounds for eviction of the sex offender under this subsection. If criminal activity is alleged to be a basis of termination, the park owner may proceed directly to an unlawful detainer action;
(g) The tenant's application for tenancy contained a material misstatement that induced the park owner to approve the tenant as a resident of the park, and the park owner discovers and acts upon the misstatement within one year of the time the resident began paying rent;
(h) If the landlord serves a tenant three 20-day notices, each of which was valid under (a) of this subsection at the time of service, within a 12-month period to comply or vacate for failure to comply with the material terms of the rental agreement or an enforceable park rule, other than failure to pay rent by the due date. The applicable 12-month period shall commence on the date of the first violation;
(i) Failure of the tenant to comply with obligations imposed upon tenants by applicable provisions of municipal, county, and state codes, statutes, ordinances, and regulations, including this chapter. The landlord shall give the tenant written notice to comply immediately. The notice must state that failure to comply will result in termination of the tenancy and that the tenant shall vacate the premises within 15 days;
(j) The tenant engages in disorderly or substantially annoying conduct upon the park premises that results in the destruction of the rights of others to the peaceful enjoyment and use of the premises. The landlord shall give the tenant written notice to comply immediately. The notice must state that failure to comply will result in termination of the tenancy and that the tenant shall vacate the premises within 15 days;
(k) The tenant creates a nuisance that materially affects the health, safety, and welfare of other park residents. The landlord shall give the tenant written notice to cease the conduct that constitutes a nuisance immediately. The notice must describe the nuisance and state (i) what the tenant must do to cease the nuisance and (ii) that failure to cease the conduct will result in termination of the tenancy and that the tenant shall vacate the premises in five days;
(l) Any other substantial just cause that materially affects the health, safety, and welfare of other park residents. The landlord shall give the tenant written notice to comply immediately. The notice must describe the harm caused by the tenant, describe what the tenant must do to comply and to discontinue the harm, and state that failure to comply will result in termination of the tenancy and that the tenant shall vacate the premises within 15 days; or
(m) Failure to pay rent by the due date provided for in the rental agreement three or more times in a 12-month period, commencing with the date of the first violation, after service of a 14-day notice to comply or vacate.
(2) Within five days of a notice of eviction as required by subsection (1)(a) of this section, the landlord and tenant shall submit any dispute to mediation. The parties may agree in writing to mediation by an independent third party or through industry mediation procedures. If the parties cannot agree, then mediation shall be through industry mediation procedures. A duty is imposed upon both parties to participate in the mediation process in good faith for a period of 10 days for an eviction under subsection (1)(a) of this section. It is a defense to an eviction under subsection (1)(a) of this section that a landlord did not participate in the mediation process in good faith.
(3) Except for a tenant evicted under subsection (1)(c) or (f) of this section, a tenant evicted from a mobile home park under this section shall be allowed 120 days within which to sell the tenant's mobile home, manufactured home, or park model in place within the mobile home park: PROVIDED, That the tenant remains current in the payment of rent incurred after eviction, and pays any past due rent, reasonable attorneys' fees and court costs at the time the rental agreement is assigned. The provisions of RCW 59.20.073 regarding transfer of rental agreements apply.
(4) Chapters 59.12 and 59.18 RCW govern the eviction of recreational vehicles, as defined in RCW 59.20.030 , from mobile home parks. This chapter governs the eviction of mobile homes, manufactured homes, park models, and recreational vehicles used as a primary residence from a mobile home park.