I'll give you my unique perspective.  

The best option is to find local corporate housing providers in whatever region or market you're searching.

This house was so unique.

Their keys were somewhat unique, and came stamped with 'Duplication Prohibited".

For everyone else's benefit, the short term rental situation in Estes Park is unique because the town and surrounding area requires a permit to do short term rentals in Residential zoning districts.  

@Edward Kozic - if you don't have the financial capacity to qualify for the loan, then find a money partner.Talk with some local home builders to see what local or regional bank they use for funding their projects.

It's a small year, without any unique features/difficulties. 

Opportunities for higher cashflow and appreciation vary greatly regionally, and that's where this game is played. 

FHA does require that the property be owner-occupied.Keep shopping around to other banks and concentrate on local/regional banks and credit unions.

Replacement cost approach (not used as much, but sometimes used for new construction, or in unique cases like yours and/or to add some support to the other two methods)The appraiser may use a combination of these.