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Unmarried couple buying home, what are the options in our case?
You are thinking about this very well.  With option one, you need to think about the 5 D's in the contract.  What happens when one partner becomes disinterested, divorced (break up), does drugs (something illegal), dies or does not agree with decisions. One complication if you buy jointly, and decide to break up/move, on will the other partner be able to refinance?  If not the leaving person will probably not be able to finance a new home as the banks are rarely willing to assume multiple mortgage risks for one person.  (High income/large down payment not with standing.) I prefer the one person rents option to option one.  The trouble with that is that it sounds like you are in better position to be the owner, and she has a higher emotional need to own.    If she is really interested in building equity I would recommend a 15 year or shorter mortgage.  Building equity in a 30 year is not realistic.