If it looks like it could be a good deal, I will then arrange to check the property out to determine my rehab costs.

If int rate is over 10%, the loan must be negotiated and arranged by a licensed broker to protect the lender from usury laws.The broker can not just be a figure head (I gather he is, from your post), he must negotiate the transaction.You might want to stay at or below 10% .Amir Levi

How do those arrangements work in terms of cost/payment?

Does she have any alternative for living arrangements?

What I would really like advice on is who I should refer the seller to and what kind of arrangement should I try and make so that I get something for my efforts ... a realtor, commercial broker, commercial wholesaler, someone I know who might be interested in buying, etc.?

I love what I do : > I have been enjoying arranging Rent To Own transactions in a few states and have been learning as I go the wholesaling for a few months.

The way it is set up they have authority to act on behalf of their client on financial matters and issues regarding living arrangements.

This is my first loan arrangements and as people are saying its pretty decent/low interest rate.

The arrangement we have is this:  we find the deal, he makes the purchase, both parties look for an end buyer, and both parties split the profit 50/50.  

Best would just be to arrange the normal pay schedule to align with on time 100% completion.I try to avoid "sticks" since this is construction and "stuff" happens....if something is bad enough for a stick, I will probably have another one of my crews come to finish the work and just backcharge accordingly.As far as "carrots" sometimes I will offer incentives to finish early, work weekends, ect, just depends on the project.