Every finite complex is the classifying space for proper bundles of a   virtual Poincar\'e duality group
  We prove that every finite connected simplicial complex is homotopy equivalent to the quotient of a contractible manifold by proper actions of a virtually torsion-free group. As a corollary, we obtain that every finite connected simplicial complex is homotopy equivalent to the classifying space for proper bundles of some virtual Poincar\'e duality group. 
Raeyong Kim
math.AT math.GR