@Khurram MirzaYour underwriting model is the best way to let you sensitize the capital stack mix for the most optimized returns.

The market seems tight and the on-market selection is doesn't meet investment model. I

As for the furnace what year and model is it? 

A "shack" model is very appealing, (http://bit.ly/2vYMEw6) but after searching for awhile, I have no idea how to find this sort of real estate opportunity.

I'm not sure yet which model is right for me.Jeff

I'll send you my ebook on Building an RV Park so you can get an idea of the pros and cons.I personally love the RV Park business model.  I

Tapping to improve properties as part of your regular business model is legitimate. 

This is a Realtor who also does what I do regarding a TK model.  I

That can largely be avoided by planning ahead to keep it separate as possible,  and submeter or mitigate in other ways when not possible;  like apparently these days you can get programmable thermostats with a 'administrator' mode that will allow you to set a maximum temperature in case you end up sharing with a resident who likes to keep the house at 80 degrees with electric baseboard heat.   

In my model, I treat myself as a consultant, real estate agent, and general contractor.