I could see this fit into several categories of 'real property trades or businesses.'

A mobile home is almost NEVER considered real property.  

@Christina Galdieri A 1031 exchange cannot be used for the sale of a business itself, as it only applies to the exchange of like-kind real property used for business or investment.

I'm finding when I look at a given property, I get inaccurate comps in two ways: 1st, a property will show up in the list as a comp to my subject property but have a REALLY low sale value; upon investigation I find that the property acutally hasn't sold in 10+ years but PropStream thought it was comp; 2nd, a property will show up as "Sold" in the MLS status, but all ownership and transaction history tab don't reflect the new data.

Discount Property Wholesalers, Real Property Network, and Coast 2 Coast House Buyers just to name a few.They can be a reliable source for off-market deals here in the Portland Oregon market.

Upon inspection the appraiser will see the crawl space and see it was a mobile home plus a HUD tag and public record.One of the requirements in mobile home financing is the property "Must" be on a concrete permanent foundation(in order to be real property) on top of that it requires concrete pillars, skirting and the "Well and Septic" dug and placed within legal distance from subject property.

Was it real property or personal property?

In other words held for steady cash flow.My VARIABLE (note) PORTFOLIO consists of more active/speculative notes - non performing notes I purchased at discount to principal owed; notes I hope to “work” for enhanced ROI, real property I “purchased” with a leaseback option to repurchase, and defaulted notes I purchased planning on eventually taking ownership of the real estate, as well as notes I created that don’t have current payments but provide a guaranteed return plus an equity “kicker” when the property is sold. 

I came across one of these loan agreements online somewhere a few months ago, can't recall where I found it but it was clear in reading the loan agreement there was no language referencing the loan actually encumbering real property, it was just an unsecured loan.  

@Franklin Perez how is getting a license going to allow you to access off market properties?