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Prestressed flat slab in seismic zone 4

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The architect has proposed a structural system consisting of prestressed
flat slab on rcc columns at 9.0 m by 9.0 m grids with rcc shear walls.
The building lies in seismic zone 4. Apart from using Rw=8 (ubc 94),
100% seismic shear to walls, flat slab frame non-seismic resistant with
deformation compatibility, are there any other aspects to be considered
in design. Especially regarding detailing of slab-column joints and
the effect of prestressing?
M. A. Mufti