For cities and states buried under mountains of debt, it has become a tantalizing proposition: invite private financial institutions to put up the money to fix aging schools, dilapidated rail lines and beat-up roads. Offer investors steady returns on the projects. And give the public the modern services its governments can no longer afford…. But as more cities consider packaging needs as prime business opportunities, questions are growing about how well the profit motive fits with the ideal of serving communities. Some officials worry about yielding control to private interests that can raise fees and decide which neighborhoods to serve based on profitability….