Options for unused land in single parcel

[Robin Creamer]

So I bought a single family house with a 2.1 acre lot.  The house sits on one end of the lot and there is 1.75 acres to the side of the house that is just grass with 400+ft road frontage.  I spoke with the county and they told me I basically need 3 acres to split the lot for building another house(1.5 acres for each lot). That was my initial plan after brrring the original house. After that idea was shot down I started thinking about putting a metal building on the land and renting a few larger indoor rv spaces. Technically I'm not supposed to put anything commercial on the land. Since its an outbuilding that would be associated with the house I think it would be ok.  Does anyone have any insight on this or have any other thoughts on possible options.