  We present the asymptotic analysis of 3D conformal gravity as a SO(3,2)
Chern-Simons gauge theory with Minkowskian (flat) and AdS boundary conditions.
We further extend these boundary conditions to the case where the Weyl mode and
the partial massless mode are allowed to fluctuate. The latter leads to loosing
one copy of the Virasoro algebra and the former to a u(1) current extension of
the asymptotic symmetry algebra and shifting the Virasoro central charge by
one. We also give a pedagogical canonical and asymptotic analysis of 3D pure
gravity as an ISO(2,1) Chern-Simons gauge theory with flat boundary conditions.
