A higher dimensional gravity invariant both under local Lorentz rotations and
under local Anti de Sitter boosts is constructed. It is shown that such a
construction is possible both when odd dimensions and when even dimensions are
considered. It is also proved that such actions have the same coefficients as
those obtained by Troncoso and Zanelli.Comment: 5 pages, no figures; final version to appear in Phys. Lett.