In the year 2000, what is the campus fee for San Francisco State University?
SELECT t1.campusfee FROM csu_fees AS t1 JOIN campuses AS t2 ON t1.campus  =  t2.id WHERE t2.campus  =  "San Francisco State University" AND t1.year  =  2000
campus fee for San Francisco State University in the year 2000 refers to joining tables on campus id to match 'San Francisco State University' and filtering the result for the year 2000 to get the campus fee.