It is rare that doing business with a party requires you to ensure the legal status of the other party. There are some exceptions to that, but here the legal risk is upon the party required to obtain the license, insurance, comply with zoning and codes, etc. That being said, if you arrive and the premises are unclean, appear unsafe (you don't see smoke detectors, you don't feel the locks are adequate, etc.), then having a back-up plan within your budget would be a good idea. But that is always a good idea when traveling, right? You can then report the negative situation to the organization and voice your disapproval.
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Leases in WA almost always state that the rental agreement is between the landlord and the named tenant, and that the tenant is not to sublet or invite other persons to reside in the premises without written permission from the landlord. The reason is that landlords are always entitled to know exactly who is residing in their property.
But on the other hand, tenants can have visitors or guests. If the landlord objects to the presence of visitors or guests, the landlord's remedy is a 10-day Notice to (the tenant, not the guest) Comply with Lease Terms or Vacate. If the tenant does not comply timely, then the landlord can commence an unlawful detainer action. Against the tenant.
YOU have done nothing wrong or unlawful, and as such you cannot get in trouble with either the landlord or the City. Especially if your plan is to stay there for less than a week (7
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