Litigation firm moves to new office, complete with fake courtroom

Law firm Manion Gaynor & Manning LLP has moved into a larger office at 125 High St. from a building at the edge of the Financial District, space that includes a mock courtroom to practice trial arguments and impress clients. The national firm moved its Boston headquarters into the fifth and sixth floors of the high rise last week, kicking off a 10-year lease on approximately 35,000 square feet. Its former office at 21 Custom House St., where its Boston office had been for two and a half decades,…