I have a mental block for figures under 10%, but I'm not really clear on what's considered reasonable in this respect...

It helps me keep things in order mentally.

I’ve been doing a lot research and trying to cut through the bull being promoted by “gurus” and just getting honest feedback. 

I would recommend sharing your plan with them (so that they can match you with the most relevant loan products), learning about their experience in investing, and asking them what they are fueled by the most in their work.There are many technical questions you can ask, but I find that mortgage lenders are highly regulated in our new housing market (post 2008), so when I'm dealing with the reputable firms in my area I want to focus on getting to know the Loan Officer and understanding if they have the mental skills to help me accomplish my goals. 

@Aaron MarxHere is a useful mental exercise.

Old school mentality and I’m two for two on dealerships since I moved, that don’t align with my standards of business (long term business minded vs short term gains) I agree though after having these conversations.

The intent and want has to be self serving and you need to truly look in the mirror and be honest with yourself.Having the abundance mentality is the right mindset.  

Put a promote structure in place, specially for this one off deal.

I subscribe to both, but we (the CRE community) need to push / help promote other platforms to keep the CRE search / research platforms competitive.  

They have an intensive vetting process and guide sponsors to the offer that would perform best with their audience.From what I saw, most multifamily offerings have an 8% preferred return and 30-50% sponsor promote thereafter.