As Nathan said, you need to do your homework and go into this meeting extremely prepared. You say the meeting is happening this week? That is unfortunate, because I recommend you spend the next month preparing. If you're trying to sell a billionaire on lending you nearly $70 million dollars for some speculative waterfront deals, you need to go in prepared to talk about:
LOCATION - Access to property, comparable properties, demographics, schools, etc
LAND - Lot size, zoning requirements, entitlements, surveys, plot plan, utilities, etc
BUILDING - Isometric plan, unit count, amenities, how it conforms to zoning, what you will do if variance required, etc
TEAM - Who will be the architect, builder, structural engineer, mechanical engineer, electrical engineer, civil engineer, etc?
TIMELINE - How long will each phase of the project take? When will this project be stabilized?
FUNDING - How much money do you need? When do you need it? Are their any other capital partners proposed?
PRO-FORMA - What will the numbers look like and what will the return be on this deal?
Those are just the thoughts that come to mind right now. I'm sure there are a dozen other things to consider. And once you have all of this information together, you should put it in a professionally bound pitch deck. Something this billionaire can walk away with and study on his own time after the meeting.