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Z ’ Reservation at LC 2000

We consider the possibility that one extra Z ≡ Z ′ exists with a mass of more then two TeV and fermion couplings that do not violate (charged) lepton universality. We show that, in such a situation, a functional relationship is generated between the deviations from the SM values of three leptonic observables of two-fermion production at LC 2000 that is completely independent of the values of the Z ′ mass and couplings. This selects a certain region in the 3-d space of the deviations (Z ′ " reservation ") that is characteristic of the model and that would have no observable intersection with analogous regions corresponding to other interesting models of new physics.