What would be the typical cash flow per door for a 4-plex?  

So a family member gets sick and let her house which was bank owned with a mortgage get behind on her mortgage and utility bills to the point of potential foreclosure.

She is looking for freelance work to bring in some extra money.I can utilize her for working on my social media presence, SEO, and some other administrative tasks around marketing.I have already told her that it will probably be small tasks to start out with and I can't pay her anything steady until I start getting more deals and bring in more income as I scale.Curious what everyone is paying for this type of work?

Some sellers will include estimated vacancy and maintenance, typically 8 to 10% a piece.

More often than not mechanics break down as a result of the house being foreclosed and not utilized for an extended period of time. 

On the other side, you could have a new build that owner pays no utilities there are no major maintenance issues because the building is brand new and operating expenses ratio could be 30-40%. 

Is this a typical practice?

Smaller jobs typically charge more per square.  

Since we have a property recently paid off, I am wondering what are the options out there we could use to utilize this opportunity. 

I still have baseboard heating so even though the ski season would get good utilization, the economics don't work with the inefficient heating setup.French Broad (local power co) is running a program to sell ductless split unit heat pumps at cost and will finance them.