There are a lot of issues here. The first and most important is I would think 10 times before doing this with friends and or family. A lot can go wrong and does all of the time with an investment properties and even if its a finical home run, things can go wrong with all partnerships let alone family ones. Everything is always great in the beginning, but as things happen its easy to go off the road fast and hard.
Having said that and I would caution against it. Make sure everything is in writing, make sure everyone has the same short and long term goals, I would also have buys outs and capital calls worked out and part of the agreement in writing.
Where is a lot to deal with example is everyone going to be a guarantor on the debt, most lenders want owners of 20% or more to be guarantors of the debt.
As far as the economics that's the easy part. Maybe do a preferred of around 9% and a split between the working partners and non working ones. Could be 50/50 or 70/30 or what ever anyone agrees to.