This is how larger investment partnerships are put together. The sponsor (you) puts up little or no money and your friend all of it. He has no say in the business and you control all decisions. He gets the preferred return up to the agreed percentage first, and thereafter all cash is split 70% him and 30% you. This applies to liquidity events such as a sale or cash out re fi. You can see this structure on crowdstreet.com an active platform for accredited investors, mostly multi-family.
So you get 30% of the deal for finding, managing and selling a construction project. And none of your own money at risk. You're free to negotiate your best deal, but I would treat investors, especially friends fairly.
This structure mostly applies to all equity deals. If you're looking for institutional debt (bank or non-bank lender) they're likely to require you to put some of your own money in, and you both to personally guarantee the loan. You can PM me if you want some more detail on all this.
BTW--I lived in Westfield NJ for 10 years or so, and had friends in Ridgewood. Liked Westfield a lot but don't miss the winter, or commute to NYC.