California Code, Civil Code - CIV § 2924k

(a) The trustee, or the clerk of the court upon order to the clerk pursuant to subdivision (d) of Section 2924j, shall distribute the proceeds, or a portion of the proceeds, as the case may be, of the trustee's sale conducted pursuant to Section 2924h in the following order of priority:

(b) A trustee may charge costs and expenses incurred for such items as mailing and a reasonable fee for services rendered in connection with the distribution of the proceeds from a trustee's sale, including, but not limited to, the investigation of priority and validity of claims and the disbursement of funds. If the fee charged for services rendered pursuant to this subdivision does not exceed one hundred dollars ($100), or one hundred twenty-five dollars ($125) where there are obligations specified in paragraph (3) of subdivision (a), the fee is conclusively presumed to be reasonable.