Providing a million-dollar warning to lawyers to draw clear lines when sharing office space, John Landreth used a “partnership by estoppel” claim to tag Raymond P. Fabricius P.C., with $951,719 in liability for the actions of Keith Leigh, of Pool & Leigh P.C., who reportedly conceded he was negligent in representing Landreth.Landreth’s complaint alleged he hired Leigh, at what he thought was a firm …