You will lose the previous listing and be starting over. 

Your definition is correct for "legal non-conforming".The "legal" part of "non-conforming" is dropped when it doesn't apply so most commonly people call these units "non-conforming", "finished", "in-law suite/unit", or "bonus unit".Non-conforming: Any property that doesn't meet current zoning requirements.Legal non-conforming: A non-conforming property that was lawfully established under previous zoning regulations and is allowed to continue its use.Based on his posts @Mario Morales is referring to a non-conforming unit.

@Nida Chaudhry,Given the demand you've seen, a 30x60’ garage with varied storage options could be appealing.

I don't know how many properties you have, but I've only got the one and this is our first long-term tenant (previously furnished MTR).

Rent a storage unit in a nearby town, ship all items to storage unit, pay someone to then use the items to furnish the home or make a weekend trip 

The ones I manage total to 20 bedrooms.These rooms rent for between $125 to $225 per week depending on room size and amenities in the room (beyond basic amenities may include: Desk, Tv, private entry, tenant controlled AC, additional storage).This month after padsplit takes their 14.25% cut of the revenue I am recieving, from the units I own, $15,230 from 3 homes.

Market in a MinuteEast Tennessee home sales decreased 7.8% from the previous month, and decreased 1.0% from a year ago.The median sale price was $371,250 — up 9.19% from the previous year.Total housing inventory increased from the previous year – up 38.3% from a year ago.Half of the homes sold were under contract in 20 days or less, up from 11 days a year ago.40.55% of homes sold for the asking price or above, with 18.77% selling for more than the asking price. 8.04% sold for at least $10,000 over asking and 2.88% sold for at least $25,000 over asking price.The sale-to-list price ratio decreased from last month to 97.5% – down from 97.9% a year ago.New construction represented 12.36% of total home salesData Deep Dive: How's the market?

Listen to @Henry Clark  If I were doing anything self-storage, he'd be my first call. 

I have little over 100k in an IRA from previous employer.

Maybe city is getting ready to go crazy on solar and needs a spot for a battery storage area.