Abstract
A new class of models is constructed in which the third family quarks, but not leptons, experience a new $\mathrm{SU}(2)$ or $U(1)$ gauge force. Anomaly cancellation enforces the introduction of spectator quarks so that top and bottom quark masses are naturally generated via a seesaw mechanism. We find the new contributions to the $(S,T,U)$ parameters and $\mathrm{Zb}\overline{b}$ vertex to be generically small. We analyze how the reasonable flavor mixing pattern can be generated to ensure the top-seesaw mechanism and sufficiently suppress flavor-changing effects for light quarks. Collider signatures for the light Higgs boson and top quark are also discussed.
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