Chicago — Offshore, a 52,300-square-foot rooftop deck, has opened on the third floor of Chicago’s Navy Pier. The Guinness Book of World Records has named the establishment “the world’s largest rooftop deck.” KOO, a Chicago-based architecture and commercial interior design firm, designed Offshore to allow guests experience a luxurious “cruise” for the price of a meal or drink. The deck includes a bar, kitchen, terraces, seven fire pits, an entertainment and gaming area and multiple gathering spaces. Culinary direction for Offshore is led by Executive Chef Michael Shrader. Modern American …