The lake is home to some early San Francisco architecture : the remains of Alban Nelson Towne 's 1101 California Street , Nob Hill house can be found by the lake , between JFK Drive and Crossover Drive . After the 1906 earthquake and fire devastated the building , his wife presented the portico , popularly known as " Portals to the Past " , to the park in 1909 . All that remains of the mansion are the ionic columns of the entrance , which stand in isolation
1906 earthquake
1906 San Francisco earthquake
Lloyd Lake (San Francisco)