A generalization of no-scale supergravity models is presented where scale transformations and axion-like classical symmetries of the superstrings in four dimensions are explicitly realized as dilations and translations of the scalar fields in the Kähler manifold. A sufficient condition is that the (dimension one) dilaton fields can be arranged in matrices of a Jordan algebra. This determines four possible classes of irreducible manifolds which are symmetric spaces. An arbitrary number of matter (dimension one-half) fields can be included in the Kähler potential in such a way as to preserve the algebra of isometries. Among other Einstein manifolds, one obtains all Kähler symmetric spaces. This inclusion defines a generalization of flat potential models with zero cosmological constant and scalar-fermion degeneracy except for massive fermions along the flat directions of the scalar potential. For two classes of manifolds and a trilinear superpotential, a SU (1, 1)×U(1) subgroup can be promoted to an exact symmetry of the effective lagrangian.