Del. Code tit. 3 § 926
The duties and functions exercised by the Foundation under this chapter, and any amendments hereof or supplements hereto, are and will be in all respects for the benefit of the people of the State and for the protection of their health and welfare. To this end, the Foundation shall be regarded as performing essential governmental functions in exercising such duties and functions and in carrying out this chapter and any law relating thereto, and shall not be required to pay any taxes or assessments of any character, levied either by the State or a political subdivision thereof, upon any of the property used by it for such purposes, or any income or revenue therefrom, including any profit from a sale or exchange. The acquisition and transfer of preservation easements hereunder shall be exempt from all realty transfer tax imposed under Chapter 54 of Title 30 and any county or municipal ordinance requiring payment of a realty transfer tax.
3 Del. C. § 926