Rezoning from warehouse to ...

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I have an interest in a building between commercial/industrial and R1/R2 residential. The building I am interested in is zoned "warehouse" or light industrial...I would like it converted to mixed use(?)-Home on the top and a shop on the bottom. 

I have no interest in the condition as it sits so would need this to be rezoned before moving on it. It's overpriced right now and have not contacted the listing agent as those are 2 big hurdles... before doing so, I am just curious if any of you have negotiated on a building with a rezoning contingency and how long it may have taken if so? (I get that every city is different and no planning and zoning personnel are probably very pleasant to deal with)