Cal. Corp. Code § 310
(a) No contract or other transaction between a corporation and one or more of its directors, or between a corporation and any corporation, firm or association in which one or more of its directors has a material financial interest, is either void or voidable because such director or directors or such other corporation, firm or association are parties or because such director or directors are present at the meeting of the board or a committee thereof which authorizes, approves or ratifies the contract or transaction, if
(3) As to contracts or transactions not approved as provided in paragraph (1) or (2) of this subdivision, the person asserting the validity of the contract or transaction sustains the burden of proving that the contract or transaction was just and reasonable as to the corporation at the time it was authorized, approved or ratified.
A mere common directorship does not constitute a material financial interest within the meaning of this subdivision. A director is not interested within the meaning of this subdivision in a resolution fixing the compensation of another director as a director, officer or employee of the corporation, notwithstanding the fact that the first director is also receiving compensation from the corporation.
(b) No contract or other transaction between a corporation and any corporation or association of which one or more of its directors are directors is either void or voidable because such director or directors are present at the meeting of the board or a committee thereof which authorizes, approves or ratifies the contract or transaction, if
(2) As to contracts or transactions not approved as provided in paragraph (1) of this subdivision, the contract or transaction is just and reasonable as to the corporation at the time it is authorized, approved or ratified.
This subdivision does not apply to contracts or transactions covered by subdivision (a).