New York Laws
Part 1 - Rules Governing Trusts
7-1.17 - Execution, Amendment and Revocation of Lifetime Trusts

(a) Every lifetime trust shall be in writing and shall be executed and
acknowledged by the person establishing such trust and, unless such
person is the sole trustee, by at least one trustee thereof, in the
manner required by the laws of this state for the recording of a
conveyance of real property or, in lieu thereof, executed in the
presence of two witnesses who shall affix their signatures to the trust
instrument.
(b) Any amendment or revocation authorized by the trust shall be in
writing and executed by the person authorized to amend or revoke the
trust, and except as otherwise provided in the governing instrument,
shall be acknowledged or witnessed in the manner required by paragraph
(a) of this section, and shall take effect as of the date of such
execution. Written notice of such amendment or revocation shall be
delivered to at least one other trustee within a reasonable time if the
person executing such amendment or revocation is not the sole trustee,
but failure to give such notice shall not affect the validity of the
amendment or revocation or the date upon which same shall take effect.
No trustee shall be liable for any act reasonably taken in reliance on
an existing trust instrument prior to actual receipt of notice of
amendment or revocation thereof.