You can place two separate residences in one residence.Housing for many families in one building.  These patterns may be arranged in several different configurations, including side by side or on top of each other.  Two separate entrances inside and outside the house is another distinguishing feature of a duplex house

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In fact, an important and basic element in the decoration of duplex houses is the staircase.  The design of the staircase has a direct effect on the division and attractiveness of the decoration