With a forward-thinking vision for a university bistro, Toronto-headquartered DesignAgency was born. Two decades after serving steak tartar to students, business is booming for founders Allen Chan, Matt Davis, and Anwar Mekhayech, who can rattle off hostel brand Generator Hostels, The Ritz-Carlton Hotel Company, St. Regis Hotels & Resorts, and culinary brands Nando’s and Momofuku from a high-profile client list. On the books: rollouts for workspace and cultural hub NeueHouse and new Hilton…