The present paper addresses the tactical logistical problems in the seaside subsystem of port container terminals. The research goal is to structure optimization model to support tactical planning in maritime container terminals with annual capacity below 1 million TEU per year, which are typical for wider regional environment. In the narrow sense, the optimization model solves the problem with different basin layouts where two quays are placed independently. As a result of research, an integrated optimization model has been developed for the seaside subsystem that combines three typical logistical problems: Berth Allocation Problem, Quay Crane Assignment Problem and Quay Crane Scheduling Problem. The model is represented by the optimization process to takes up in three stages: initialization, allocation and synchronization. A typical feature of the process is the selection of the optimal handling scenario which is obtained as a result of the optimization function defined by the minimum total service time of ships in port and the optimum utilization of the quay cranes capacity. As a result of the optimization, for each ship the best suite handling scenario is selected among three pre-defined options, depending on the stowage location onboard and depending on specific requirements of shippers. The methods of operations research has been used in the developing models, that is, methods of linear and integer programming and the assignment method. The model is tested on a sample of 100 virtually generated vessels with simulated stochastic times of arrivals and cargo handling demand. Vessels are arranged in groups of 10, 15 and 20 in accordance with the expected time horizon planning. The results show the applicability of the model for solving tactical operational problems in the seaside subsystem of targeted port container terminals.