  We study the minimal geometric deformation decoupling in $2+1$ dimensional
space--times and implement it as a tool for obtaining anisotropic solutions
from isotropic geometries. Interestingly, both the isotropic and the
anisotropic sector fulfill Einstein field equations in contrast to the cases
studied in $3+1$ dimensions. In particular, new anisotropic solutions are
obtained from the well known static BTZ solution.
