Tax issues with buying a coop for parents?

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Hello! This is my first post, I'm very happy to have found these forums.

3 years ago, my parents gave me $50k to add to my own downpayment for a coop. This was their life savings, so I didn't accept their money for myself, but I did set it aside so I can figure out a retirement strategy for them. Now I am thinking I'd like to buy a coop for them with their own money. Since they don't want to deal with a mortgage at this stage in their lives, I'd be buying it under my name. What kind of tax issues will I be dealing with?

Thanks to anybody who can help!