There are many heritage residential neighborhoods in Baghdad some of them belong more than thousand years because this city is taken the important cultural and social place for hundreds years. In last decades, the issue of preserving, rehabilitating and investing heritage residential neighborhoods has received increasing attention at all political, cultural and academic studies. The biggest problem that prevent the developing design in these places are the historical privacy, the weakness in the structures, the high cost because the rehabilitation and maintenance require the high and special skills experiences. Because of the historical and cultural value and what it represents a wealth of all humanity, the studies and researches that studied these subjects avoided the wading in make bold decisions to get the new design of these places, but limited their interest to the study of job investment in those neighborhoods in particular. In addition to, the role of maintenance and rehabilitation operations in supporting this investment, and from the reality of the shortcomings in the study of economic investment policies in dealing with these neighborhoods and the mechanism of protecting them. The importance comes of studying the maintenance and investment policies of these neighborhoods.