  In this letter, we provide an alternative method to study the area spectrum
of certain classes of extremal black holes which have near-horizon geometry as
warped AdS. We argue that previous methods which are based on the existence of
quasinormal modes may not be applicable in the extremal limit. The topology
difference of the near-horizon geometry between non-extremal and extremal black
holes implies a separate treatment is needed to study the area discreteness in
the extremal limit. To be specific, we will study area spectrum of
supersymmetric BMPV black holes/black rings and Reissner-Norstroem black holes
at the extremal limit. Inspired by the recently established Kerr/CFT and RN/CFT
correspondence, we propose a new way to quantize the area regardless of the
(non-)existence of quasinormal modes or zero Hawking temperature. At last, we
propose a dilute gas model and harmonic oscillator model which have same
degrees of freedom as the dual CFT.
