Need advice forming a partnership

[Andrew Bish]

My friend bought a duplex and has offered to let me buy in. My main objective will be to be a resident of one unit and manage the other rental. Our arrangement will be for me to be a 20% owner, then we split operating expenses and tax advantages 50/50. Even if my name is not on the mortgage, Can I take a 50% tax advantage? we don't know how to start so we're looking for advice.