The city has always been a phenomenon, especially nowadays where the majority of the population lives in urban areas that exploit over 80% of available resources. Therefore, in the context of increasing urbanization and the need for economically sustainable practices, efforts are being made to raise citizens' awareness about the environment, particularly regarding sustainable urban development and economic sustainability. In all of this, it is important to highlight the connection between sustainable development and economic sustainability. Insatiable human needs lead to environmental degradation, making sustainable development a key factor in urban planning. The implementation of sustainable development changes people's lifestyles and helps cities achieve a balance between economic progress, social inclusion, and environmental protection. The concept of the 15-minute city represents the idea of a sustainable city, based on the idea that citizens can meet their basic needs within a 15-minute bike ride or walk. Additionally, one of the numerous examples of sustainable cities is Vienna. Vienna has developed its strategy to fight against climate change and preserve the environment under the name Smart City Vienna. This paper emphasizes the importance of implementing the concept of sustainable development in urban planning to achieve economic sustainability and improve the quality of life for citizens.