How can I paint buildings for people?

Leonardo Da Vinci painted for numerous people, but he didn't just paint canvases. He painted famous buildings and houses that made his work well known. Now, I want to do the same. I want to paint buildings of large companies and one day paint the white houses. However, I don't know where I can find people willing to give me such an opportunity. I want a chance to engrave my name in history and paint the largest monument ever. How can I do this? Where can I find these opportunities?