Just beyond the covered walkways surrounding the $325 million transformation of the Gallery at Market East sits a woman with a cardboard sign. On it she has scrawled, “Recent widower and hungry.” Her name is Michelle, she tells me when I stop at 12th and Market to talk. She won't give her last name. She’s 46 and has been on the streets for about a month. Chances are you've seen a lot of people like Michelle lately, on the streets, inside the subway stations, keeping warm on vents, and under stairways. Panhandling and sleeping, and sometimes squatting inside the bathroom...