A significant problem in the development of ports and port areas is the understanding that port development plans brought by port authorities in the capacity of the harbor area management body do not usually cover the spatial planning of cities and counties, but also vice versa. The above mentioned points out that port authorities get acquainted with the solution plans brought by the cities and counties only through the opinion of the competent administrative body for the implementation of spatial planning documents when it is already late for significant changes. The above points out that the relevant parties (port authorities and cities / counties) in the process of the port area planing do not always take an active part in the planning process of the ports and associated port areas in the spatial planning documents. As a result there are port areas which are not based on port development plans and which often do not satisfy neither with the structure of the represented port activities nor with its capacities, and especially not with the area and shape of the port area. Considering the issue of development of the port area in spatial plans it is evident that the spatial plans of the counties do not pay enough attention to the role, significance and development of the port of county and local importance. The elaboration of spatial plans related to the port of county and local importance requires high expertise and multidisciplinarity, as well as knowledge of spatial planning issues, port operations, marine biology and coastal areas, maritime transport technology, all the way to the protection of the marine environment. From the aforementioned, the basic aim and purpose of the conducted research is to find an optimal model and measures for the development of the port area in relation to the complementarity of the spatial concept of the port and the city. For the purposes of defining and setting up the model, the most important indicators and measures have been used which influence the level of spatial planning of the port and the city. The checking and proving of the success of the set model is carried out in the example of the Port of Rovinj. Thera are different models (5 scenarios) of the port area development presented in the paper in relation to the complementarity of the port and city concept of the spatial concept that have accepted the existing problems in the development of ports and cities, as well as foreseen solutions (activities / measures) for their solution. For testing purposes, in the paper thera are proposed models: V ̶ determined portions of port area development and their interest links ̶ established criteria (indicators) that affect the development of the port area as an integral part of the city concept ̶ conducted surveys (6 surveys) to obtain relevant data in the necessary criteria for evaluation. After defining the criteria, size and weight using the computer program and multicriteria analysis, the obtained results were analyzed and then tested on the example of the port / town of Rovinj. Based on the results obtained in the dissertation it was concluded that the proposed models of development of the port area in relation to the spatial concept of the town can be applied to any other marine port system in the world. Through the multi-criteria analysis, it was concluded that the scenario of the ports in function of the economy - tourism and public long distance and liner transportation is the optimal scenario for the development of the port area of Rovinj. The results of the research also provides a good basis for further improvement of the port development model as well as for theoretical examination and adoption of new regulations related to the urban development of the ports, the city and the surrounding area.