I am closing on Friday and am getting a little cold feet.

Depending on location, what the foam is made out of (polyurethane is most common, I believe), other characteristics of the foam (R-value, whether it's water soluble, etc) and how difficult it is to install (are the cavities open or will the foam need to be injected through walls, etc) will determine the cost, but you're probably looking in the $2-5 per square foot (of cavity space) range.

I do know it is maybe 5 feet long and 2 feet high.

Looking at a set of #4 four plexes built 1980 in Marion, IA - each unit is a 2 bed 1 bath 700-800 square feet.

I am looking for a partner/partners and mentors to help me get my feet wet in real estate, as well as start building successful relationships/connections.

Two weeks after graduating I was in escrow on a 5,000 square foot piece of dirt a block from the beach with the intent of building three homes on it fashioned after the typology one my teachers and mentor, Brett Farrow had pioneered here in San Diego.

Most of the single families I have looked at are less than 1000 square feet which is on the smaller size even for a single family home.

House was a wreck when we got it and the majority was cleaning nicotene off of every square inch.

When looking at realtor.com try to keep in mind the square footage and age of the comparable property.

Have you considered cutting the bottom 2 feet of drywall out and replacing?