re: MT Shark Tank - Undeveloping Commercial/Residential Properties

There's the charity route which could work depending on your networking skill, or the government contract route which could take years and require greasing lots of political palms. If you're in an area that's actively gentrifying then you could lobby some of the construction companies to see if they need a similar service. There's also superfund site clean up, but that's haz waste, not so much derelict buildings.