OK, so I work in development and while this seems very unfair to you, the idea is pretty common. The developer has the "idea", sources the deal, does all the legwork getting permitting, putting together consultants, managing construction, etc.
The developer (your friend) has to pitch this to the investors (you) to show them this is worthwhile. Has he put together a business plan? A proforma model showing potential profits? Had an preliminary discussions with governing bodies regarding zoning, easements, permitting etc?
In our business, once we have a plan for successful project, we typically negotiate an 80/20 split (sometimes different depending on project) between the developer (who is the general partner and manager) and the investors (who are limited partners and passive investors). The 20% is sometimes called the "promote".
In your case, assuming you have vetted this and are going to move forward - I would want at least 80% for the investment of money with a preferred return of 8% (to make up for time your money is not on the market). Since you are both providing the labor and legwork, I would demand to split the remaining 20%. If you are truly doing an equal amount of work, I guess 10/10 is fair.
So when this sells, you 1. get your capital back 2. get the return on investment 3. get 10% of the GP split.