International Paper Co., Stamford, Conn., is considering adding a REIT investment option to its $4.2 billion 401(k) plan, said Carol Sung, manager of 401(k) product management. "We want to unitize what we have on the pension side, but if we can't leverage the pricing, we may do a search," she said. IP's $6.5 billion defined benefit plan has about $520 million in real estate equity. She declined to name the manager. The 401(k) plan has 13 core investment options and a self-directed brokerage account, Ms. Sung said.