The Raiders played their first game at the stadium on September 18, 1966. In 1968, the Kansas City Athletics moved to Oakland and began play at the stadium. The Athletics' first game was played on April 17, 1968. The stadium complex cost $25.5 million ($ adjusted for inflation) to build and rests on of land. On April 17, 1968, Boog Powell hit the first major league home run in the history of the Coliseum. On May8 of that year, Catfish Hunter pitched the ninth perfect game in Major League history at the Coliseum. The Coliseum hosted the 1967 and 1969 AFL championship games. Additionally, the venue had hosted the second match of the NPSL Final 1967. 1970s From 1970 to 1972 the stadium hosted three college football benefit games featuring Bay Area schools versus historically black colleges. The Coliseum hosted the 1971 East–West Shrine Game on January 2, 1971. In 1972, the Athletics won their first of three straight World Series championships and their first since their years in Philadelphia. The awkwardness of the baseball–football conversion, as well as the low seating capacity (around 54,000 for football) and that the prime seating on the east side consisted of temporary bleachers led the Raiders to explore other stadium options. One such option was Memorial Stadium on the UC Berkeley campus. Several preseason games were played there in the early 1970s along with one regular season game in 1973 (a 12–7 victory over the Miami Dolphins during September while the A's regular season was going on). However, in response to traffic and parking issues associated with these games (while Cal games drew a large number of students who live on or near campus and walk to the games, Raiders games attracted fans from a larger geographic area who were used to tailgating at the Coliseum and were more likely to drive to games), the City of Berkeley passed a Professional Sports Events License Tax in which the city collected 10% of all gate receipts, making the staging of professional games inside the city cost-prohibitive. The Raiders were granted an injunction from the city collecting the tax, arguing that the tax was a regulatory measure rather than a revenue measure, and was therefore an improper regulation on land held in trust by the Regents of the University of California. However, the grant of the injunction was reversed by the California Court of Appeals,