Look them up.Local REI meetings are a good place to find these unregulated loan sharks, but not saying they may not be fair, if they have the money they may be willing to get involved with you, a bird in hand type thing.Finance laws are complicated and a hard money lender limits their funding to commercial transactions, most stay away from consumer lending.

This 2014 taxes will be the most complicated one by far, with itemizing RE expenses, etc.

Unless you can pay off your existing mortgage with the down payment of $37k or $45k, you can't really seller finance this deal (at least not without a much more complicated wrap or subject-to arrangement). 

To complicate matter the sellers per the contract are supposed to finish remodeling one of the units, which is currently pretty gutted.

This can be more complicated to negotiate since your partner will want a good return for their effort, but you want to pay as little as possible to maximize your return. 

It's more complicated than a max rate for the current period. 

Probably legal, but complicated and asking for trouble.

It is a complicated loan, but the average Seller and listing agent don't know that, which is why it is important to have a conversation with the Buyer's Agent and loan officer on the process to get it streamlined as best as possible.  

Then, be honest and open about it, with messaging that flows from the deep truth of why you are a wholesaler.To not disclose this complicates things down the line. 

If you are going to set it up as a syndication structure where someone is charging fees/equity for doing all the work then you will need to work with a syndication attorney to set it up and the structure gets a little more complicated.