Oregon Revised Statutes Revenue and Taxation § 307.811

(2)(a) In order for the long term care facility to be exempt from taxation under this section, the owner of the facility shall file with the county assessor a copy of a certificate issued by the Department of Human Services under ORS 443.888, certifying the facility as an essential community provider long term care facility.

(b) The certificate must be filed with the assessor on or before April 1 preceding the tax year for which the exemption is being claimed.

(c) Notwithstanding paragraph (b) of this subsection, a certificate may be filed with the assessor on or before December 31 of the tax year if accompanied by a late filing fee of the greater of $200 or one-tenth of one percent of the real market value of the property to which the certificate applies.