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Cities are growing at a rapid phase, due to exponential growth of populations all over the world. The world population might stabilize by 2070 after reaching the peak population levels of about 9 billion. Already the urban population, living mostly in cities has reached 50% of the world population. Cities in the last few centuries have evolved coping with changes in social, economic, cultural, aesthetics, utility, historical, political, natural and environmental factors. There is always an interface between the interests of old and new generations of people sharing the same space. The buildings have more life than the people living in them. Each building is at least able to provide space for at least two generations. The comfort levels of one generation and the next are different in same space. There are often changes brought with time in any building. Similarly the infrastructure is also changing at a rapid phase as the transportation means and systems are changing. The access to power, drinking water, and open spaces for cultural and social events, educational institutions, markets, etc. also impacts the living space. The security and basic amenities are the main factors of consideration for not moving away from the congested cities. There is always an overlap of old and new adaptation factors, creating resilience for coexistence. The remembrance of a space and events in once own life time impact the people, and they love to continue in similar space. There is a kind of energy that one gets, while returning to the same space, it is often seen that the old people prefer living in the space they are used to and they often live longer too. There are emotions too acting up on the life of the people. Considering all the above factors, each city can be considered a single organism, having its own identity and also there are various diverse spaces within it. It is like a human body single living things, but various parts of the human body function for the happiness of the whole. There is a need to understand multifunctional and multilayer dimensions of the cities, for making a sustainable living in the cities.