I wouldn't do a lot of architectural plan work until you know what complies with city code, especially if that particular parcel may have any limits/constraints.

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Have a developer working on designs at the moment to see if even possible with city codes.

Now here I would say you should disregard any bid that doesn't strictly follow the bidform, or does not complete in by the deadline. 

Any recommended zip codes ?

you have to look at your building code and talk to GCs who have done it.

That would be against code of course.

Curious if there are whispers (or shouts) in Columbus about the same I go to city council meetings almost every Monday and they are extremely developer friendly and new construction friendly. while there is pressure, I don't think it will ever happen. columbus wants to see economic development and would not place legislation that would restrict the free market in my opinion. right now they are doing the opposite and redoing there zoning codes to allow for higher density and higher height as well as parking reductions. just google "zone in" columbus and you'll see. there's a lot of articles about it. 

Ther are very strict regulations that limit the kind of creative stuff you can do in the residential arena. 

It will be great if I can remotely set up entry key code for open house or new tenenant.