This project, named B-space, concentrates on the urban generation rent in 2030. The project questions how to design a vehicle tp meet various demands in users' different life stages. To deal with this problem, I got the inspiration to include balcony window in B-space. When the window is closed, the car is a small city car for 2 people, which is easier to drive and park but after opening the rear window, the rear part forms a bigger space for users to sit or for moving storage. Also, under this scenario, the vehicle can be used as a family car for 3 or 4 people. B-space provides a proposal for a future city vehicle and because of its versatility, it provides people with a more environmentally friendly and sustainable travel mode.