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Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statements (No. 333-272063 and No. 333-281153) on Form S-8 of California BanCorp (the “Company”) of our report dated April 1, 2025, relating to the consolidated financial statements of the Company, appearing in this Annual Report on Form 10-K of the Company for the year ended December 31, 2024.

/s/ RSM US LLP

Los Angeles, California

April 1, 2025