The BlackRock Muni Intermediate Duration Fund, Inc. operates as a closed-end investment vehicle, sponsored by BlackRock, Inc., with its management entrusted to BlackRock Advisors, LLC. This fund focuses its capital allocation within fixed income markets, primarily targeting high-quality municipal bonds. A key requirement for these bond holdings is their investment-grade rating, exemption from federal income taxes, and an initial duration ranging from three to ten years upon acquisition. The fund was established on August 1, 2003, and is headquartered in the United States.