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1. ... is at the south end of the Golden Gate Bridge.
2. ... is the capital of California.
3. ... is in Silicon Valley.
4. ... has the highest city proper population of the three.
5. ... is where Haight-Ashbury, the epicenter of the hippie movement in the late 1960s, is located.
6. ... has the coldest average summer high temperature of the three.
7. ... has the hottest average summer high temperature of the three.
8. ... is in the name of a National Basketball League team.
9. ... is in the name of a National Football League team.
10. ... is home to a National Hockey League team.
11. ... is the farthest north of the three.
12. ... is the farthest south of the three.
13. ... has the tallest building of the three.
14. ... is where Visa, Uber, and Salesforce are based.
15. ... is where Adobe, eBay, and PayPal are based.
16. ... is on a river with the same name as the city.
17. ... is where the Supreme Court of California is headquartered.
18. ... has the lowest elevation of the three, as measured by the elevation of its city hall at ground level.
19. Its main daily newspaper is the Mercury News.
20. Its main daily newspaper is the Bee.