  Three - dimensional static and spinning black hole solutions of the
Einstein-Klein-Gordon system are obtained for a particular scalar field
configuration. At large distances, and for small scalar field, the solutions
reduce to the BTZ black hole. The scalar field dresses the black hole with
secondary scalar hair, since the scalar charge is related to the conserved
black hole mass and is not an independent charge. A self interacting potential
is included, containing a mass term that is above the Breitenlohner-Freedman
bound in three dimensions. Independence of the scalar potential from the
conserved black hole charges, imposes fixed mass and angular momentum to scalar
charge ratios. The thermodynamic properties as well as the energy conditions of
the black hole are analysed.
