Well, near the geographic center of the city, anyway.  Adolf Sutro got rich by building a tunnel in the Nevada mines and then bought much of the western half of San Francisco. Beginning in 1886, he planted an enormous forest there, most of which is long since gone to housing developments.  The nearly 60 remnant  acres on Mount Sutro are owned by the University of California San Francisco.  The aging, nonnative eucalyptus trees are shingled with ivy in most places.  The place is at once both lovely and inhospitable.