The Shakespeare Foundation is a private non-profit organization exempt under IRC Sec 501(c)(3). The mission of the Foundation is to increase literacy among youth and introduce inner-city youth to classic works of literature, like Shakespeare. Which of the following regularly conducted activities would most likely be subject to unrelated business income tax (UBIT)?

		Sale of Shakespeares books in the Foundations bookstore.
		Rental of facilities to Ritchie Park Elementary School for use in a poetry reading event.
		Rental of an apartment to a local Boy Scout Group.
		A Shakespeare used book donation event where books are given to children, free of charge.