In a writ, filed at the Technology & Construction Court, Prudential claims the firm failed to carry out adequate inspections of the pipes between the oil tank and boilers in Wingate House, Shaftesbury Avenue, when carrying out replacement works in 2001.
Fuel later began to leak from the pipes between the tank and boilers causing a severe oil spillage.
Prudential alleges Lorne failed "to supervise the works adequately or at all, organise the works so as to prevent the leaking and spillage from occurring and to detect and stop the leaking within a reasonable time".
It alleges the amount in damages it is owned by Lorne Stewart comes to £1.83 million. Lorne Stewart was unavailable for comment.