One of the reasons San Francisco elites met with resistance when attempting to redevelop the downtown area was the deep counter cultural, bohemian, working class and immigrant communities made possible by .

economic growth without property speculation (cheap rent) from WWII up until the late '80s

Explanation:

Immediately, after the post-war of world war 2, various communities migrated to San Francisco during this period, looking for new means of survival from the remnants of bohemian culture in America, this is basically due to the cheap cost of living in San Francisco.

Hence, one of the reasons San Francisco elites met with resistance when attempting to redevelop the downtown area was the deep counter-cultural, bohemian, working-class, and immigrant communities made possible by "economic growth without property speculation (cheap rent) from WWII up until the late '80s."