qualified real property
(1) In general For purposes of this section, the term “qualified real property” means real property located in the United States which was acquired from or passed from the decedent to a qualified heir of the decedent and which, on the date of the decedent’s death, was being used for a qualified use by the decedent or a member of the decedent’s family, but only if— (A) 50 percent or more of the adjusted value of the gross estate consists of the adjusted value of real or personal property which— (i) on the date of the decedent’s death, was being used for a qualified use by the decedent or a member of the decedent’s family, and (ii) was acquired from or passed from the decedent to a qualified heir of the decedent. (B) 25 percent or more of the adjusted value of the gross estate consists of the adjusted value of real property which meets the requirements of subparagraphs (A)(ii) and (C), (C) during the 8-year period ending on the date of the decedent’s death there have been periods aggregating 5 years or more during which— (i) such real property was owned by the decedent or a member of the decedent’s family and used for a qualified use by the decedent or a member of the decedent’s family, and (ii) there was material participation by the decedent or a member of the decedent’s family in the operation of the farm or other business, and (D) such real property is designated in the agreement referred to in subsection (d)(2).