claims by the Chargers, the stadium would only generate about $2.3 million extra in additional hotel tax revenue each year, but estimated the annual public costs would be $67 million for the operation and constructions of the project. They also stated that attempts in other cities to combine a convention center with a football stadium had largely failed, citing Indianapolis, St. Louis and Atlanta. On August 21, 2016, the San Diego County Taxpayers Association announced its opposition to Ballot Measure C. The association claimed the project could cost the city at least $400 million and probably more, and the city would likely have to pay the difference using the general fund. Controversy Cory Briggs, the attorney who authored the Citizens’ Plan, stated that Ballot Measure C did not create a new special tax on San Diegans, and therefore required only a simple majority of votes for the measure to be approved. San Diego City Attorney Jan Goldsmith publicly announced on August 5, 2016, that since it allocated taxes towards a specific project, instead of a general fund, that Ballot Measure C was a new special tax on San Diego, and would need a 2/3 majority of votes to pass. In August 2016, the Chargers purchased Facebook ads targeted towards Chris Cate, a Republican City Council member, for his opposition to Ballot Measure C. The ad gave Cate's office phone number accompanied by the text, “Why does Chris Cate want the Chargers to leave San Diego? Please call and ask him.” In a statement, Cate said his office received approximately 200 calls in response to the ad. He claimed that many of the calls were polite, "some that were belligerent" and "one threat that was referred to the police." Cate said he was a Chargers fan, but "I just think this is a bad deal for the city and San Diegans.” Relocation to Los Angeles After a failed bid with the Oakland Raiders to build a stadium in Carson, California in January 2016 the Chargers received the first option to relocate to Los Angeles and share the winning bid (SoFi Stadium) with the Los Angeles Rams, conditioned on a negotiated lease agreement between the two teams. The option if not taken by the Chargers would have expired on January 15, 2017, at which time the Oakland Raiders would have acquired the same option. On January 29, 2016, the Rams and Chargers