Thank you for your question.
From your description, the business is community property and each spouse is entitled to half of its value.
If either of you alone had started the business, it would still be community property, under Family Code § 760:
"760. Except as otherwise provided by statute, all property, real or personal, wherever situated, acquired by a married person during the marriage while domiciled in this state is community property"
There is an exception for inheritances under Family Code section 770.
"770. (a) Separate property of a married person includes all of the following: (1) All property owned by the person before marriage. (2) All property acquired by the person after marriage by gift, bequest, devise, or descent. (3) The rents, issues, and profits of the property described in this section. (b) A married person may, without the consent of the person's spouse, convey the person's separate property."
You can get a free consultation from some of the dissolution attorneys listed by location here.
I hope this information is helpful.