Sidley Austin LLP, an international law firm with almost $3 billion in revenue and 20 offices worldwide, has signed a lease at 830 Brickell, the new Class-A+ office tower nearing completion in Miami’s Brickell Financial District. Sidley signed a three-floor, 60,000 square-foot lease at the 55-story tower, marking the largest new-to-market office lease signed in the city’s urban core this year.