I am looking for recommendations for best financing options.The owner is considering financing it, but until they agree, I am planning as if they will not do so.The local credit union I use, who is very investor friendly, is unable to lend on properties larger than 4 units right now. 

For me it's family, friends, and the food.

Was wondering if anyone has used a Binishell home as a STR? More to the point has anyone purchased land and found a contract to build a concrete dome home. If so what was your experience and would you do it again?

Take a look at this podcast from BP - it goes over Beginner friendly ways to start investing and you will take alot from it. 

I also have a close friend who only deals in large apartment complexes.

(Bigger Pockets does not have an investor friendly agent in this area)

one thing is your lending your money way under what private money should charge. unless your just doing your friends a favor..

If you want private investors, start by asking friends, family, or colleagues in your network who may wish to a passive income opportunity. 

Center Point is not investor friendly anymore so I would advise staying away from the rental side.

I am an investor friendly agent, and an investor myself in small residential multifamily in central MA.