Most investors focus only on rates and points, but there are a number of other factors I would consider more important than paying 1 point less or 1% less on an interest rate.

The additional costs not factored include: adding electricity to the additional 5 units, paving the driveways (would use either limestone or asphalt), and then the biggest expense and unknown would be bringing in the additional mobile homes.

-likely but without my handy crystal ball, the timing of that will depend on not real estate but other factors.  

Those vacancy can depend on several factors:- Are those rental priced competitively?

That could also factor in on how good of a deal this is.

The main factors to consider are efficiency, expertise, communication skills, and fees.

Factor this into your hold/timeline.

Typically an appraiser is focusing on only the last six months of sales.We've been pretty steady the last few years, and so factoring in sales from 2yrs ago will not be wildly off target.

Price isn't the biggest factor, ease of use is for me due to the demands of running more than one business. 

How to solve the financing in personal name question, especially with multiple unrelated parties, is another complicating factor (but if you go directly to an LLC/DST, the loan will be commercial so that might solve this question).