The search for outdoor spaces in dense city dwellings has become for some a necessity and for others a requirement to be fulfilled. In short, it is one of the most sought-after commissions that architects around the world receive on a daily basis. Beyond the fact that this phenomenon has been accentuated during the Covid-19 pandemic, since their origins, these expansion spaces have been conceived not only to increase the use of natural lighting and ventilation but also to promote the indoor-outdoor relationship, giving the possibility to accommodate various uses and functions even when square meters are scarce or when the connection with nature is glimpsed far over the horizon.

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In large cities, it is becoming increasingly common to find buildings that are capable of admitting different configurations and layouts in their internal spaces. Towards the end of the 1960s, duplex typologies began to appear in buildings in the city of Buenos Aires, when the Building Code allowed them to be located in the obligatory setbacks of the upper floors.

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