Evolutionary design methodologies generally aim to present new form-finding processes, where nature-based approaches are used, such as self-organization, genetic algorithms etc. This paper aims to present a new architectural design approach that focuses on integrating these different evolutionary methods in an emergent process. The main goal is to achieve a high-level of integration where lacking qualities of each evolutionary method are completed by the other one in a synergic and especially emergent behavior. A multi-level design approach is described in this study. Points highlighted are concerned with the pre-design phases. Within a bottom-top simulation, an infinite high-level solution cluster is revealed from behavioral interactions and collectivity of the low-level entities: agents. Simulated design process is visualized by a determined project area in Istanbul: Kurucesme Island on the Bosphorus as an exhibition center. Programmed in 3dsMax, simulation phase supports the creative design process in early phases.