Post tension slab-Slab On Grade- Building pad drops

[KB2016]

Hi,

I am designing a slab on ground post-tension slab for an apartment building. Size of the pad 38'x175'. Building pad contains about 8 apartments. Each apartment drops about 8", which makes 4'-8" drop at one end of the pad. What's the best approach I should take to design and economically feasible?
Do I design each apartment individually (38x22)? Or suggest client for three segments(drop).
I never had experience designing any building pad ( post-tension) drops like this. I really appreciate your valuable input. Thanks - KB

 

[rapt]

Reinforced concrete sounds good to me for this. Why do you need to use PT?

 

[KB2016]

rapt, thanks for your reply. I agree with you but PT by owner's Choice.