Is it okay to say to my realtor, "Hey, help me get this deal done and you'll make your money when we buy the large multi?"  

The plot also contains 9 studio apartments.

The reasons wholesalers make money are essentially 1) speed to close, and 2) large deferred maintenance that precludes typical sales.

This way they are not incentivized to go over budget and they have an added incentive to come in below the GMP.We do this all the time on large projects.

I don't have personal experience with a HOA ever lowering dues back down but then I never experienced such a large increase.

That is great and you are stepping into a large amount of doors that are already performing!

Something is off here.For a conventual loan on something around the $150k house I pay around 2%.Hard money, commercial loans, or double closes will cost more as there will be points added.

I never write them without adding in taxes and insurance.

It also largely depends on the area and the type of tenant said area attracts. 

The property has 3 units, and will be owner occupied, but I added the owner unit rent as if I was renting out the whole complex to see what the numbers looked like and here is what I got.