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day immediately prior to the 2019 annual meeting of shareholders."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F9","text":"These restricted stock units vest in accordance with the following schedule: 302 vest on the earlier of May 13, 2017 or the day immediately prior to the 2017 annual meeting of shareholders; 302 vest on the earlier of May 13, 2018 or the day immediately prior to the 2018 annual meeting of shareholders; and 303 vest on the earlier of May 13, 2019 or the day immediately prior to the 2019 annual meeting of shareholders."}],"balance_after":605,"derivative":{"underlying":"Class A Common 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the earlier of May 8, 2016 or the day immediately prior to the 2016 annual meeting of shareholders; and 303 vest on the earlier of May 8, 2017 or the day immediately prior to the 2017 annual meeting of shareholders."}],"balance_after":0,"derivative":{"underlying":"Class A Common Stock","underlying_shares":303},"source":{"system":"sec-edgar","filing":"0001209191-17-032860","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1034054/000120919117032860/doc4.xml","form_type":"4"}},{"id":4318771,"issuer":{"id":3263,"kind":"organization","name":"SBA COMMUNICATIONS CORP"},"owners":[{"id":139784,"kind":"person","name":"CARR BRIAN C","position":1,"cik":"0001287502","reported_name":"CARR BRIAN C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common 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