A lot of less experienced rehabbers seem to like more entry-level, working class neighborhoods around the city like Beechview, Brookline, West View, etc.

I am all in for less than 90K a side , in a neighborhood of 300K single family homes .My out was that the lot 8 doors down , just the lot , sold for $ 150K  .

A small addition costs more per square foot than a large addition.Your best bet would be to find a couple projects in the neighborhood you want to do it in and hunt down the people that did them and see what it cost them and then back into the cost per square foot.

Comps in the neighborhood have recently sold between 135k and 155k.

Essentially a longterm 'lot flip' based on the growth of the area or a neighborhood.2) Buying to build.

We know Cuban officials want more openness with the US, but The day after Obama visits there, Fidel pens an anti-American letter, which is printed in the newspaper.  

The cost of other (non-new construction) houses in the neighborhood have no relationship to the cost you'll incur to build a new house.Your costs will be based on a lot of factors:- Location- Level/type of finishes- Style of house- Size of house- Whether you GC it yourself or hire a builder- The types of contractors you use- Your negotiating ability- How strategic you are with your designs to keep costs downI've built houses for $60/sf, and I've built similar houses in other locations with different contractors for $90/sf. 

Especially since I'm investing in KC from out of state, I prefer properties near very good schools (like in Blue Springs), which should keep my house values stable if not appreciate slightly more than ones in less desirable neighborhoods.

In Nashua, as you know, you need to be careful of neighborhood. 

A savvy investor will not be turned off by a boarded up house, but they will be turned off by a neighborhood full of them because that indicates something about the area, demand, ability to resell or rent, etc...Hope that helps, feel free to reach out with any questions