Since FNMA DUS lenders share risk with FNMA, more decisions are delegated to DUS lenders compared to Freddie Seller/Servicers.

I'm new here too, but if you want to compare notes just let me know!

@Felix Sharpe-- Here is my strategy ... a combination of the below approaches:(1) Market Approach: Review rental prices of comparable properties currently listed on the market.

I think this fits that.I haven't compared comps yet, but would normally I would go to Zillow for prices of similar homes sold in the 1-3 mile area (maybe more, if necessary).  

Rates are comparable to 30 year fixed at 4.5%My main reason to refi is to grow portfolio and build commercial credit portfolioLoan officer did indicate he can u/w new loans for additional properties.

Compare to Detroit when the auto industry tanked.

Disclosure:  I am not an mortgage broker nor am I an investor but I am a licensed real estate agent in MA.question #1: You can pay for an appraisal but you can also work with a licensed real estate agent in your area to have them do a CMA (Comparable Market Analysis).  

What makes mobile home park special (compared to apartment and houses).3.

Ask to compare to what was advertised at time of sale. 

A real estate market analysis is a study of current market values of homes, comparable to yours, that helps you determine the market value of your house.