(a) Solely for the purposes of Part 2 (commencing with Section 2601) of this division, “employer” also means any employing unit which employs individuals to perform domestic service in a private home, local college club, or local chapter of a college fraternity or sorority and pays wages in cash of seven hundred fifty dollars ($750) or more to individuals employed in such service during any calendar quarter in the calendar year or the preceding calendar year.
(b) Any employing unit which qualifies as an employer under this section shall not be treated as an employer with respect to wages paid for any service other than domestic service specified by this section unless such employing unit also qualifies as an employer with respect to such other service under Section 675, 676, 677, or 678.