The study aims to organize operative situation for all examples of the "City Convenience Increase Agreement" as an approach for maintenance and utilization of public space by Public-Private Partnership, and to consider characteristics and problem of this agreement. As a result of the study, this agreement has characteristic that agreement matter and target space is flexible. So this agreement is used variously, for example strengthening the public positioning of companies for promoting urban renaissance. But this agreement has problems, for example sustainability.