EXHIBIT 23.2

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the 2005 Stock Incentive Plan of National Mercantile Bancorp of our report dated March 28, 2005, with respect to the consolidated financial statements and schedules of National Mercantile Bancorp included in its Annual Report (Form 10-KSB) for the year ended December 31, 2004, filed with the Securities and Exchange Commission.

/s/ ERNST & YOUNG LLP

Los Angeles, California

May 23, 2005