I'm not sure about real estate agents, but I know banks hire business' to completely clean out forclosed houses and do small repairs (bored up broken windows, change locks, lawn mowing ect...). I had a buddy who worked for one of those business' and he'd call me whenever he was close to my place. He'd give me all the metal. His company was throwing everything into a container to be taken away so I was saving them money by taking the weight.