During this period, 15 skyscrapers taller than 400 feet in height were constructed in Seattle, including 901 Fifth Avenue (1973), the First Interstate Center (1973), the Henry M. Jackson Federal Building (1974), 1600 Seventh Avenue (1976), Rainier Tower (1977), 1111 Third Avenue (1980), 800 Fifth Avenue (1981), Union Square (1981 and 1989), and the Westin Building.