What should I ask Alexander the Grate?

No typo there, nor has backward time travel been invented.  I will be doing a Conversation with him, and here is a brief summary:

He has lived on various heating grates in Southwest D.C. for almost all of his homeless life, which is why he introduced himself as “Alexander the Grate,” when he and I first met in 1983. Several years ago, he told me this: “The bottom line is that the urban homeless in Washington, D.C., don’t create structures. We can’t because of the restrictions. Rather, we impose ourselves into the interstices of the infrastructure.”

So what should I ask him?