Cyberguard Corp. leased 30,148 square feet of office/flex space at 350 Southwest 12th Ave., which is part of the Quadrant Business Center in Deerfield Beach. Based in Fort Lauderdale, Cyberguard provides advanced intrusion prevention solutions. Robert Listokin Partner at Colliers International represented the landlord, State Teacher's Retirement of Ohio. David Brown of Studley represented the tenant.