With an M.Arch. in hand, Natasha Case, 27, didn’t set out to build buildings, but ice cream with a cookie roof and floor slab. She and co-founder Freya Estreller, 29, started the food truck Coolhaus in 2009 in L.A. and named the sandwiches after architects and designers. “We think of ourselves as a marketing company for architects,” Case says. They expanded into Austin, Texas, last year, and then into New York City this spring. Come Labor Day, you can pick up Richard Meyer Lemon Ginger and Oatmeal Cinnamoneo at a cart in Central Park. • eatcoolhaus.com