They will take the permit fee and send an inspector that will provide some assurance that the work was performed correctly.

I have serious doubts that the company officers have maintained their fiduciary duty to RAD's investors in many of these related-party transactions. 

Quote from @Samuel Pavlovcik: @Nicolas Tow Your Architect is correct that it sounds like the only option for you would be to obtain a Zoning Map Amendment to change to RT3.5 or higher.

Keep in mind that the same entity (in this case, your LLC) that holds title to the relinquished property must also acquire the replacement property to maintain the tax-deferred status of the exchange.Additionally, don't forget about depreciation recapture.

If it’s in an LLCs name it s protected if maintained correctly.  

AND the side you live on you can rent out a room or two depending on the number of rooms in your duplex or you have the option to maintain your privacy and sanity and keep it to yourself.  

Sometimes the tenants are coming from shelters or other communal type of housing where maintaining a space my not be solely there responsibility so maintaining the unit may not be to your liking. 

Nights, weekends, holidays, etc.To keep this on-topic, though...DO figure out what's healthy for you to manage but remember it's a process where every experience teaches you good and bad (and be patient with that process).DON'T sweat the small stuff (damage/costs under $50, undisclosed dogs, etc.) but DO find a way to learn, prevent, put in better practices to maintain your sanity. 

If an LLC is the best way to go, should I create the LLC in Idaho using an address I plan to maintain in Idaho?

So, you can do a land contract for 12 months, which should allow lender to credit you full value of the land vs the purchase price, but the loan will pay off the land contract, so the lender maintains first lien position.Can't help you with the rest of your question, but you should be able to search for "CPA" here on BP to find experts to reach out to.