Tokyo Skytree is the tallest freestanding tower in the world. The tower is a popular tourist attraction with two observational decks at an altitude of 350 and 450 meters. This paper aims to understand the importance of the efficient flow of visitors within the Tokyo Skytree. We utilize a discrete mathematical model based on Petri Nets and the tool GPenSIM to simulate the visitor flow. Through simulation, we explore how the flow of visitors change by increasing and decreasing the elevator specifications. The results show that the specifications of the elevators play a crucial role in efficient visitor flow. The model and its implementation presented in this paper are specific to Tokyo Skytree. However, the idea presented in this paper can be easily adapted to model any other tall buildings too.