BUT CALIFORNIA, the entire 400K is recognized gain for California.

Qualified Opportunity Zone Funds

The TCJA established Opportunity Zones. IRC Sections 1400Z-1 and 1400Z-2 provide a temporary deferral of inclusion of gross income for capital gains reinvested in a qualified opportunity fund, and exclude capital gains from the sale or exchange of an investment in such funds. California does not conform to the deferral and exclusion of capital gains reinvested or invested in federal opportunity zone funds under IRC Sections 1400Z-1 and 1400Z-2, and has no similar provisions. If, for California purposes, gains from investment in qualified opportunity zone property had been included in income during previous taxable year, do not include the gain in the current year income.