Okla. Stat. tit. 62, § 62-690.20: Limitation upon benefits already conferred

The provisions of this act shall not operate as a limitation

upon any benefit conferred upon an enterprise prior to July 1, 1999.

An enterprise which has previously qualified for a benefit or

incentive pursuant to Section 690.1 et seq. of Title 62 of the

Oklahoma Statutes prior to July 1, 1999, or which has expended money

or undertaken an obligation or made a location decision in reliance

upon the conditions prescribed by Section 690.1 et seq. of Title 62

of the Oklahoma Statutes or other provisions of law related to

benefits available based upon location of business activity within

an enterprise zone shall continue to be entitled to all such

benefits or incentives on and after July 1, 1999.