Steel and glass skyscrapers may work in the climates of New York City or San Francisco, but in tropical Singapore they heat up fast. So WOHA Architects designed the 30-story Oasia Hotel Downtown as a green vision for better tropical towers. Plants creeping across the facade and several sky gardens cool the structure naturally. 20 species of plants and flowering vines crawling across the aluminum mesh exterior afford the hotel located in Singapore’s Central Business District a lush appearance. Eventually the entire building should be covered with the plants. For now, guests can stay in one of 300 rooms and explore sky gardens in the tower. With Oasia, we’ve seen so many birds and insects flying around the building. People respond so well to seeing a hummingbird flying right outside their office window.” If the plants grow as planned, the tower could be more densely covered with verdant plant life in around a year.