Many researchers overcoming the ICT challenges in smart cities attempted to propose frameworks and architectures. In this relation, existence of a well-constructed business plan has been recognized as a significant factor to ensure alignment of architecture with smart city visions and goals. However, some of the proposed architectures do not have a business plan and goals and just follow innovation spirit or resource saving goals. This study intends to explore some different architectures from with regard to their business layers. For this purpose, by in-depth analysis of the prominent enterprise architecture concepts, this study derives an evaluation framework in form of architectural requirements for business layer. Then, five types of the relevant smart service architectures are explored with regard to these requirements. Outcome of this research is comparison of different types of architectures regarding the architectural requirements for a comprehensive business layer.