You would need to install road and utilities, but we'll cover that later.But, send the R2 zoning text (the language of their zoning code) and we can help you determine from there.Thanks.~ Scott

Don’t alter your minimum requirements to fit a potential tenant.  

Then, after all inspections are passed, close it back up and finish it off.Also, you might ask the building official if you can submit a professional engineer's letter that says he saw the construction, and that it was all done according to the applicable codes. 

There is no required holding period in the code, regulations or rulings other than you be able to demonstrate that you did in fact have the intent to hold for rental, investment or business use. 

We have the luxury of our own crews and subs which we use for our custom home builds and intimately know the code officers and zoning issues.  

That said, by adding the basement as living space to the first floor unit, you are not asking for a change in legal use, but you are (officially) altering the building in ways that will affect it's potential occupancy (and you will need a Certificate of Occupancy from the city before you can move in, rent, etc).

Just make sure to comply with the building code in your jurisdiction.

Are there any fines, code violations on record with the County, because of this mobile home?

Sadly this person is being outed (as well as the family) * side note (family of MD's and Esquire's) and the courts are not being as kind to him (them) but are still not favoring the landlords or the town he counter sue's for doing things like cutting the grass when he does not or even perform repairs on the home to remain in code with the town....

You might be expected to bring it up to current code in a gut rehab.