Trouble is the appraiser couldn't find comparable properties because of the uniqueness (not a normal duplex).

There is a possibility of reducing your taxable income to near zero with rental property deductions, but only a tax professional reviewing your unique and specific situation can determine that for you.

They are familiar with the different constriction of MH and have access to the materials and parts that are unique to MH. 

I don't see you getting deals funded without a pref except for perhaps unique deals like house flips on a smaller scale. 

Take their input as valuable advice but you can always be unique as to your business offeringAlso make sure you're ready to be on-call 24/7 unless you outsource maintenance.

Just understand that the primary reason is emotional - which is fine - just being honest is important.what i think is unique the what I call the Silicon valley effect..  2 mil for a 1500 sq ft rancher.. and then in the driveway are used Camry. you go to other areas of the country.. and you have the 150k house with the new SUV  Camper boat probably as many toys as the cost of the home .. this is quite regional.

So what unique profession combines all of these seemingly different careers?

It's about $50-70k over the median, but the neighborhood is desirable, unique, and has a high ratio of owners to renters.

Is this common or unique? 

For those actively selling:Give the appraiser some data that you used to list your property: cost of repairs or remodel completed, unique items about neighborhood, comps from your realtor.