Has anyone had experience with a Boston-region prefab building company for multi-family development?

Would this effect the property value by decreasing the income I could have had for this unit or could rehab be considered a years rent for tax and property value purposes? 

As for Zoning, I gave a call to my friendly town development team today and they were extremely nice and helpful.

Aside from the differences in ideology, I find the discussions stem in part from the underlying premises and the syntax used.Basically if money should return at least 10% on average, the leverage camp [which I'd consider myself] more or less views a return below that baseline as effectively "negative CF". 

I've spoken to a few sellers with enough equity to develop a relationship but some of these FSBOs are smart.

What would be the most cost effective way to build as many possible units?

And if I am willing to move on, you are shrinking your pool of buyers and effecting your sale price.

We may take on more debt if the value is there, but some of the most sage advice I ever received was from a long-time real estate developer:  "Have a plan to hang on to your property at least a decade." 

They're most likely trying to buy so they can demo and develop the land.

It will automatically take effect when his existing term lease expires regardless of whether he signs it or not.