N.Y. UCC Law § 2-A-517

Section 2-A-517. Revocation of Acceptance of Goods.\n (1) A lessee may revoke acceptance of a lot or commercial unit whose\nnonconformity substantially impairs its value to the lessee if the\nlessee has accepted it:\n (a) except in the case of a finance lease, on the reasonable\n assumption that its nonconformity would be cured and it has\n not been seasonably cured; or\n (b) without discovery of the nonconformity if the lessee's\n acceptance was reasonably induced either by the lessor's\n assurances or, except in the case of a finance lease, by the\n difficulty of discovery before acceptance.\n (2) Except in the case of a finance lease that is not a consumer\nlease, a lessee may revoke acceptance of a lot or commercial unit if the\nlessor defaults under the lease contract and the default substantially\nimpairs the value of that lot or commercial unit to the lessee.\n (3) If the lease agreement so provides, the lessee may revoke\nacceptance of a lot or commercial unit because of other defaults by the\nlessor.\n (4) Revocation of acceptance must occur within a reasonable time after\nthe lessee discovers or should have discovered the ground for it and\nbefore any substantial change in condition of the goods which is not\ncaused by the nonconformity. Revocation is not effective until the\nlessee notifies the lessor.\n (5) A lessee who so revokes has the same right and duties with regard\nto the goods involved as if the lessee had rejected them.\n