Construction is nearing topping out at 550 Washington Street, Google’s 1.3 million-square-foot office in Hudson Square. Designed by COOKFOX Architects and developed by Oxford Properties, the facility will join two other nearby structures at 315 Hudson Street and 345 Hudson Street to form a 1.7 million-square-foot hub dubbed the “Googleplex.” The site is bound by West Street, West Houston Street, Washington Street, and the New York Department of Sanitation offices.