Exhibit 4(a) INVESTMENT ADVISORY AGREEMENT ----------------------------- AGREEMENT, dated September 29, 2006, between BlackRock California Municipal Series Trust, a Massachusetts business trust (the "Trust"), on behalf of BlackRock California Insured...Investment Advisory Agreement • August 29th, 2006 • Merrill Lynch California Municipal Series Trust • New York
Exhibit 4(b) SUB-INVESTMENT ADVISORY AGREEMENT --------------------------------- AGREEMENT dated September 29, 2006, between BlackRock Advisors, LLC, a Delaware limited liability corporation (the "Advisor"), and BlackRock Investment Management, LLC, a...Sub-Investment Advisory Agreement • August 29th, 2006 • Merrill Lynch California Municipal Series Trust • New York
