remainder annuity trusts and charitable remainder unitrusts In the case of any charitable remainder annuity trust (as defined in section 664(d)(1)) or of a charitable remainder unitrust (as defined in section 664(d)(2))— (i) the present value of any remainder interest shall not be taken into account under subsection (a), and (ii) the present value of any other interests shall be taken in account under subsection (a), in accordance with regulations promulgated by the Secretary, as the property of the beneficiaries of such interests. (B) Charitable lead annuity trusts and charitable lead unitrusts In the case of a charitable lead annuity trust (as defined in section 2642(e)(3)) or a charitable lead unitrust— (i) the present value of any interest described in section 2522(c)(2)(B) shall not be taken into account under subsection (a), and (ii) notwithstanding paragraphs (A) and (B) of paragraph (3), the present value of any remainder interest shall be taken into account under subsection (a), in accordance with regulations promulgated by the Secretary, as the property of the beneficiaries of such remainder interest. (d) Establishment of valuation rules Not later than 12 months after the date of the enactment of this section, the Secretary shall establish rules and methods for determining the value of any asset for purposes of this subtitle, including rules for the valuation of assets that are not publicly traded or that do not have a readily ascertainable value. Such rules and methods— (1) may utilize retrospective and prospective formulaic valuation methods not currently in use by the Secretary, (2) may require the use of formulaic valuation approaches for designated assets, including formulaic approaches based on proxies for determining presumptive valuations, formulaic approaches based on prospective adjustments from purchase prices or other prior events, or formulaic approaches based on retrospectively adding deferral charges based on eventual sale prices or other specified later events indicative of valuation,