Oregon Revised Statutes Revenue and Taxation § 321.716

(a) Sale or transfer of the small tract forestland;

(b) Discovery by the assessor that the land is no longer forestland;

(c) The owner's owning or holding in common ownership more than 5,000 acres of Oregon forestland;

(d) The owner's owning or holding in common ownership less than 10 acres of Oregon forestland;

(e) Written notice from the State Forestry Department that the land no longer meets the stocking and species requirements applicable to small tract forestland under rules adopted by the Department of Revenue;

(f) The land's qualifying for another special assessment listed in ORS 308A.706 (1)(d)(A), (B), (F) or (G); or

(g) The recording of a subdivision plat under ORS chapter 92 that subdivides the land.

(a) Payment of all additional tax and interest that remains due and owing as a result of the disqualification;

(b) Submission of an application for small tract forestland assessment under ORS 321.706 and approval of the application by the county assessor; and

(c) Compliance with any applicable local government zoning ordinances governing minimum lot or parcel acreage for forest use.

(3)(a) If a sale or transfer of small tract forestland is the basis for disqualification under subsection (1)(a) of this section, the land may not be disqualified until 30 days after the county assessor issues a notice of intent to disqualify to the purchaser or transferee of the small tract forestland. The assessor shall issue a notice of intent to disqualify within 15 months after the date of the sale or transfer.

(b) The land shall automatically qualify for special assessment under ORS 321.257 to 321.390 or 321.805 to 321.855, whichever is applicable, unless the assessor determines that the land does not constitute forestland.