Pacific Mutual will loan $204 million to Fluor.

The Newport Beach insurance company is a key player in the sale of Fluor’s Irvine headquarters site to a partnership formed by Trammell Crow Co. of Dallas and First Winthrop Corp., a Boston-based investment banking firm. Another $183 million in equity capital is expected to be raised from investors, according to documents filed with the Securities and Exchange Commission. Fluor, which lost $72 million on revenue of $2.1 billion for the first six months of fiscal 1985, is selling its real estate holdings to raise cash. Escrow is scheduled to close on or before July 31.