Oregon Revised Statutes Insurance § 733.770

(1) An insurer shall not have any combination of investments in or secured by the stocks, obligations, and property of one person, corporation or political subdivision in excess of 10 percent of the insurer's assets, nor shall it invest more than 10 percent of its assets in a single parcel of real property or in any other single investment. This subsection does not apply to:

(2) Notwithstanding subsection (1) of this section and subject to approval by the Director of the Department of Consumer and Business Services in writing, a domestic insurer organized before 1950 may invest an amount not exceeding 15 percent of its assets in real property used primarily for its home office.