Firm in talks for Russia Wharf tower in downtown Boston

Investment giant Wellington Management is working toward an agreement to lease the 31-story office tower being built by Boston Properties Inc. on Russia Wharf in downtown Boston, according to several real estate executives who have been briefed on the negotiations. Landing Boston-based Wellington, which manages $550 billion in investments, would be a major coup for Boston Properties and would virtually assure a successful redevelopment of the historic complex, which also fronts the new Rose Fitzgerald Kennedy Greenway.