Just wanted to note that Olmsted ultimately didn't design GGP - the city consulted him for advice, which they ultimately ignored. William Hammond Hall, the topographic engineer, ended up being the commissioner.
[1] https://fromthethicket.com/2011/03/29/who-really-designed-go... "Interestingly, when Olmsted came to San Francisco in 1865, at the invitation of prominent citizens, and surveyed the landscape to determine a suitable location for a large urban park, he proposed an entirely different location and a very different configuration . . . more attuned to the lay of the land . . . a swath of park anchored by a large parcel hugging the lower, slopes of Buena Vista and Corona Heights, sweeping down to what is now Civic Center and from there turning north to the Bay in a wide, green boulevard along what is now Van Ness Avenue."