Billbrough & Marks, P.A. Billbrough & Marks, P.A. - Welcome Home Page - Billbrough & Marks P.A. is a boutique law firm located in Coral Gables, Florida. The experience of its attorneys in complex civil litigation and commercial disputes; business torts and insurance litigation; professional malpractice and mass torts; labor and employment; community association law; directors and officers liability; and litigation support and appellate practice provides a strong platform on which to provide today's clients legal analysis and advice.