A historic urban landscape has to be preserved wholly, not only as a cultural heritage site, but also as an environment and a neighborhood. However, cultural heritage sites have their own unique social-commercial environments, and these are not easy to integrate during the preservation process even though they are located in the same area. To examine ways of overcoming the difficulty in integrating the preservation of heritages, this study analyzes the historic urban landscape preservation of St. Augustine, Florida in the United States. The preservation of St. Augustine's historic urban landscape can be identified by its unique system of government-academy cooperation. For integrated preservation of the historic landscape of St. Augustine, Florida's state government owns the properties, which are not designated but have a heritage value, and are located next to the nationally designated heritage sites. The properties receive trust administration by the University of Florida. This cooperation between the government and the university can benefit both stakeholders. To the government, the relationship gives the benefit for professional, long-term management for the properties and their environments. To the university, the cooperation provides a place for practical education, funding, and opportunities for research and management. The government-academy cooperation model argued for this study can be applied to many Korean historic cities' urban landscape preservation planning.