The lender will offer a loan that is a percentage of the purchase and a percentage of the rehab OR a percentage of the after repaired value (ARV), whichever is less.

I'm slowly trying to learn about retail and office, in order to diversify out of multi-family or even transition totally out of it.I don't know him personally, but we have spoken and I always see his excellent posts....but,I imagine, the good brokers, like @Joel Owens , build relationships with other brokers, investors, and businesses that are always looking for space...I bet he also, gets involved locally and meets other members of the local community and are constantly networking and trying to build and strengthen their network, in regards to commercial spaces.The right broker, that is competent and concerned about adding value to a transaction, is worth the percentage they are asking for...usually.

In terms of percentages you would be doing about the same as the stock market and in the stock market you do not even have to hustle or risk loosing your hole mortgage.

What percentages should I be shooting for?

I am willing to pay the right mentor or give the mentor a percentage of what I make overall...or whatever agreement we can work out.

What percentage of the Assessed value are they funding? 

So up that percentage, perhaps 12% to include lawyer fees.

House hacking has allowed me to increase my saving percentage quite a bit.

Maybe you under write your deals with a high reserve percentage to account for this risk.

I like to do a lot of research and number work.I can’t calculate one variable, even though I know there are different formulas out there to come up with the max allowable offer (MAO).I am familiar with the ARV*.7 rule in wholesaling,but I feel there is a better formula than this to help benefit my buyers more.I wanted to know how to calculate the ROI percentage.Is there also a formula that uses an ROI percentage to reach a MAO?