Duplex for sale that is really a quadplex

[Thomas Corso]

There is a full reno quadplex for sale that was flipped and marked a duplex. Seller made a blunder and renovated 4 units even though zoning only allows for 2 at this location/property. I checked in with zoning and owner never talked to them and went on their own accord. 

The top units are both very nice and rentable. The bottom units are not rentable though, but could be used as office or storage space perhaps? Trying to Look into rezoning which will be hard to provide hardship since this property is already on their radar from previous owner. 

Looking for advice as I will need to purchase to appeal to zoning board if I even want to pursue rezoning. But figured I can cash flow anyways on the bottom two units if I get creative in the mean time anyway. 

Thanks!