Okla. Stat. tit. 15, § 1019

EXISTING INTERESTS; FOREIGN INTERESTS The powers described in Sections 5 through 18 of this act are exercisable equally with respect to an interest the principal has when the power of attorney is executed or acquires later, whether or not the property is located in this state, and whether or not the powers are exercised or the power of attorney is executed in this state.