Design & Green Hotel Buenos Aires. Palo Santo is a design and luxury boutique hotel located in Palermo, Buenos Aires. Its modern green architecture features beautiful vertical gardens, great water fountains, large, light-filled, modern and stunningly designed rooms and suites. Palo Santo is an environmentally responsible hotel. Its sustainability program covers every important aspect: energy, water, CO2 and O3, insulation, air and operations. The hotel was built to LEED (Leadership in Energy and Environmental Design) standards.