California Code, Government Code - GOV § 7308

Unless otherwise provided in the terms of acceptance or prohibited by encumbrances on the land, real property conveyed to the state under this chapter may be conveyed, transferred, exchanged, or granted only if the secretary finds that the state has received in exchange land of comparable significance or a combination of money and land of comparable significance, at least equal to the fair market value of the land conveyed, transferred, exchanged, or granted.

The findings of the secretary as to land of comparable significance or of money and land of comparable significance, and of fair market value, shall be conclusively presumed in favor of any person to whom the land is conveyed, transferred, exchanged, or granted.