Should its Floor Plan be curved or should it be curved in 3D?
If it should be curved on the Floor Plan, you may use a Polygonal Wall (or a Slab/Mesh/zero-slope Roof) to achieve a similar effect.
It it needs to curve in 3D, only a GDL Object will do, I am afraid.
There are tools to do that, MaxonForm, ArchiForma or GDL ToolBox may be used.
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