Rubenstein Partners and Nordblom Co. acquired 1000 Washington St. in early 2015 for $75 million. Rubenstein Partners and Nordblom Co. acquired 1000 Washington St. in early 2015 for $75 million.

BOSTON—Rubenstein Partners, L.P. has sold its stake in the 1000 Washington St. office building and adjoining parking garage at 321 Harrison Ave. here to Los Angeles-based CIM Group.