A partnership led by former Build-A-Bear CEO Maxine Clark and a subsidiary of Chicago-based Clayco Inc. plans a $90 million rehab that will turn the old St. Luke’s Hospital on Delmar Boulevard into apartments and collaborative office space designed for nonprofit organizations. Delmar DivINe, as its backers call it, envisions 180,000 square feet of office space in its first phase for area nonprofits and community organizations as well as 160 apartments. Ground-floor retail space will house neighborhood businesses: a bank, restaurants, maybe a gym or an early childhood center.