When suspended attorney Brandon Labiner arrived at the parking garage outside of his father’s Boca Raton law office on a bicycle the afternoon of July 1, surveillance footage captured him removing a box from a drawstring bag, opening it, and pulling out what appeared to be a gun, according to an arrest affidavit. The Boca Raton Police Department claims he paced around the garage for several minutes before coming face-to-face with his victim — his 68-year-old father, Paul Labiner — and fatally shooting him four times outside the building off North Federal Highway…