 When in use as the headquarters of the Superior Court of the District of Columbia in the 1940s, night watchmen reported seeing a man on horseback on the upper floors, where horses used to be quartered during the Civil War.They also reported seeing the ghost of James Tanner, a stenographer who took down the testimony of eyewitnesses after the assassination of President Lincoln at Ford's Theater (ironically, Robert Todd Lincoln approved the plans for the Pension Building).These stories gained such prominence that mystery writer Margaret Truman mentioned them in one of her novels.