Oregon Revised Statutes Revenue and Taxation § 316.279

A domestic or foreign business trust of the type defined in ORS 128.560 is subject to tax under ORS chapter 317 or 318 and amounts distributed by it to its shareholders shall be treated as distributions by a corporation for the purposes of this chapter and ORS chapters 317 and 318, except that distributions that are treated as unrelated business taxable income under section 856(h)(3)(C) (pension-held REITs) of the Internal Revenue Code   1 for federal tax purposes shall also be treated as unrelated business taxable income for state tax purposes.