There is a chance that investor is a securitized trust which will put your chances closer to zero of getting something done.

This was very hard and time consuming, but I'm on the other side of the permitting process and ready to build.I am estimating the 6 cabins will be about 900k to build and will be worth 2x that when built.

Reno and house appreciated quite significantly 400k to 550k estimated. 

Those that deal with the 12 1/2 % remaining have a chance for much better success OVER THE LONG TERM, in all economic environments.  

No way I would trust this to chance.

Good afternoon,Could anyone help me to estimate my monthly expenses if I rent out my single-family house in Sutton, MA?

The best way to estimate expenses is experience and knowledge of your specific asset type and market.For vacancy, that will depend on your market and the quality/desirability of your type of unit.

Are there any good resources online to be able to get an idea of average monthly/yearly expenses like utilities, etc. for a given zip or city?

It was mentioned above you could refinance into a conventional loan, however with the 5% down conventional primary residence loan on multifamily now chances are you won't refinance this FHA loan unless you plan on living there for an extended period of time and rates come down. 

The chances are super low that a HELOC will make sense on this property anyway with today’s rates, if you can even get one which is unlikely, so it’s basically a moot point IMO.