Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

How can I legally and efficiently help my girlfriend build equity by helping with a mortgage?
I agree with everyone who has simply told you 'Dont' and 'You can't' and add a few more considerations that you don't want to deal with: What you want to do is admirable but very complicated from a financial and legal perspective.  If this is really a route that you want to go down you should give up on the 'simple' and consider hiring a lawyer.