Development Budget: use RENTABLE or GROSS BUILDABLE sf?

I've expressed Cost per SF for budget items in proformas both ways, and I'm curious what folks here believe to be the better or more useful expression of development cost on a $/sf basis. Do you prefer $ per RENTABLE square foot, or $ per GROSS BUILDABLE square foot? And why? I have my opinions but want to see what others think. 

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Depends on the context.  When evaluating construction costs or leveling bids, buildable sf makes more sense.  When deciding whether to embark on a project at all and figuring out projected returns, comparing like to like (so, rentable sf) might make more sense.

As long as you're calling it out, I don't think it matters much.

 

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