Wholesale gut renovation of and addition to a historically significant building on the Upper East Side — originally designed by Calvert Vaux for the Children’s Aid Society — to house a tutoring center and an associated non-profit foundation that helps disadvantaged students succeed on standardized tests. The design creates the first office headquarters for the tutoring company with areas for instruction and independent study, as well as spaces for staff, tutors, and the foundation’s operations. The renovation equips the space with a new elevator and solves the puzzle of gracefully fitting 40 tutoring offices, a boardroom, a cafeteria, and a philanthropic wing into the building. It also encloses the rear-yard terraces on the second floor in glass, making space for the cafeteria and several additional offices. Green roofs top the new enclosures.