To someone who invests in multi-family buildings, the apartment building will be more valuable.Really, that's like asking if you had an orange tree next to an apple tree, and both were prolific producers of fantastic fruit, which tree would be more valuable?  

FB, Zillow, Trulia etc etc .......and look....compare the units that are somewhat similar to yours...bedrooms, bath, location, condition etcA lot of the "services" just use some algorithm based on bedroom, bath and sq footage.... they don't account for condition and locationSo do your own "apples to apples" search

Airbnb is similar to having a large Apt complex, there will always be a few bad apples, given enough time you will come across them.

You are comparing apples to oranges in this situation.  

Thanks @Catherine Barnes  @Steve VaughanIndeed very helpful

And we need 5 acres and a barn and water.

Apples to Volkswagens  trying to compare rates of a seller carry back private mortgage and a new origination from a bank or professional lender. private mortgages are generally written with higher interest rates.  

I specifically had them include the foundation, site-prep and utilities costs to make sure it was an apples to apples comparison and I was surprised by how low the estimate for cost per sqft was. 

Rent them the barn! 

And probably isn't a big selling point for anyone on BP to want to hire you to manage their properties.I do like the barn doors, though.