Cheryl thought she was home. After 18 months without shelter, five of them spent living in her car, she finally found a subsidized apartment in Old Orchard Beach, Maine. A housing voucher enabled her to pay $600 of the $1,035 market rent, something she could manage on her cashier’s salary. Eight years passed. Then, a year ago, Cheryl’s life was again upended when she learned that her building had…