A dient approaches your structural design consultation service regarding a new addition to a reinforced concrete multi$-$story office building. The building is regular in plan and elevation, and it was constructed in the year $2008.$ From the earthquake resistant design perspective, what would be your advice and guiding design considerations in the following cases:

$($i$)$ the client wishes to add new stories to increase floor area,

$($ii$)$ the client wishes to extend the floor area at ground level in an adjoining plot.