Seeking advice on heat exchanger selection

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There is a commercial building whose first and second floors serve as shopping areas, with a total area of 15,527.81 square meters; of this, 2,762 square meters are dedicated to a cinema. Floors 3 to 13 are residential spaces with an area of 14,240.83 square meters, and the floor height there is 3.15 meters. Floors 14 to 20 are also residential, with an area of 10,819.1 square meters and a floor height of 4.85 meters. The temperature of the hot water supply on the primary side is 90°C, while the return water temperature is 55°C. For the residential areas on the secondary side, the supply water temperature is 55°C and the return water temperature is 35°C. In the shopping area, the supply water temperature is 45°C and the return water temperature is 30°C. I would appreciate it if experts could help me determine what size is appropriate for the control panel, considering the area in question. The area calculated by my friend seems too small to me; I don’t think it’s suitable. Thank you!