Can They Inspect It?
Per Or. Rev. Stats. Sec. 90.332, the landlord can inspect the premises. So they can do that.
This is none of their business. Oregon does not provide a mandate that the tenant keep the property in a certain state of cleanliness. While they can inspect the apartment, they cannot make demands about how clean it should be. (NOTE that this is assuming that there are no local ordinances to that, either.)
If you are on a written lease, they cannot raise the rent unless the lease allows it. If you are on a month to month, the landlord may increase the rent by giving you at least 90 days’ written notice of the rent increase. The written notice must specify the amount of the rent increase, the amount of the new rent, and the date it goes into effect. No reason is needed. But again, this only applies if this is month to month.
Someone in your situation may wish to write back stating the above, and saying that while the landlord does have the right to inspect the property, that:
-incessant and pointless inspection can have you ask for a restraining order
-how clean the apartment is kept is out of their control
-no unauthorized parties live there, and
-they cannot raise rent without going through proper procedure to do so.
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