Most of the land is either wooded or utilized by a farmer down the road who pays to hay it.

This type is better especially down the road when you move and rent out the whole building. 

Parks with ~20 homes or less have higher expense ratios around 40% or more, and if there are private utilities then even higher in many cases.Are there deferred capital improvements requires for the infrastructure, roads, tree trimming, etc?  

Secondly, where serious efforts are required, tenants will not get permits and way down the road, you'll pay for that with inspection violations and delays in attempting to sell. 

The location is on a semi-main road; however, properties around this one on the same road have sold upwards of 170k+.

@Sherman McLendon Facebook ads are going to be a long road to ROI, since your market is so diverse.

Or I could cancel my application for the permit and leave everything as is without enforcement from the town. i.e. keep operating the 4 units but they will not provide a CO which clearly limits the up side down the road when I decide to sell the property.

I also get monthly cash flow and then I get the back end equity when my Tenant Buyer refinances or sells sometime down the road.

Otherwise take what you can sell it for, pay the realtor, pay off the 1st and 2nd and mosey on down the road.  

My larger point is, at this scale of construction, attempting liquidated damages is probably not the road to attempt, and I'd certainly favor the ideas that John Weidner and J Scott are suggesting.I would be curious what most here are actually using for a contract with a builder, and to what degree they are allowing contractors to dictate terms.