Hidden behind massive 120-year-old gates a few blocks south of downtown Los Angeles is Chester Place, the oldest gated community in the city. Created as an enclave of the wealthy and powerful in 1899, the remarkably intact stately mansions of this historic neighborhood were once home to the movers and shakers of politics, industry, and entertainment. Beside century-old palm trees, the former mansion of oil-industry pioneer Edward Doheny stands as the centerpiece of the neighborhood at No. 8 Chester Place, which was purchased in 1901. His family dominated the neighborhood for the next 57...