N.Y. Not-for-Profit Corporation Law § 553
(a) Subject to the intent of a donor expressed in the gift instrument, an institution may appropriate for expenditure or accumulate so much of an endowment fund as the institution determines is prudent for the uses, benefits, purposes, and duration for which the endowment fund is established. Unless stated otherwise in the gift instrument, the assets in an endowment fund are donor-restricted assets until appropriated for expenditure by the institution. In making a determination to appropriate or accumulate, the institution shall act in good faith, with the care that an ordinarily prudent person in a like position would exercise under similar circumstances, and shall consider, if relevant, the following factors:
(c) Terms in a gift instrument designating a gift as an endowment, or a direction or authorization in the gift instrument to use only "income," "interest," "dividends," or "rents, issues, or profits," or "to preserve the principal intact," or words of similar import:
(d) A rebuttable presumption of imprudence shall apply to gift instruments executed upon or after the effective date of this article as follows: The appropriation for expenditure in any year of an amount greater than seven percent of the fair market value of an endowment fund, calculated on the basis of market values determined at least quarterly and averaged over a period of not less than five years immediately preceding the year in which the appropriation for expenditure is made, creates a rebuttable presumption of imprudence. For an endowment fund in existence for fewer than five years, the fair market value of the endowment fund must be calculated for the period the endowment fund has been in existence. This subsection does not: