In 1869, Polhemus bought Rancho San Miguelito de Trinidad and sold it in 1872 to his business partner, Henry Mayo Newhall. Polhemus bought Rancho El Piojo at a foreclosure sale, and sold it in 1871 to his business partner, Henry Mayo Newhall. Rancho El Piojo and Rancho San Miguelito de Trinidad became part of the Newhall Land and Farming Company.
