Deal Structure Advice

[Alex N.]

Hi everyone! I hope you all are having a great week so far. Wanted to reach out to the site for advice on how to handle this potential real estate deal. Here goes:

My grandparents own 7 unit (6 SFH and a duplex) and are finally wanting to retire and sell them off. They approached me first about buying them. I work in property management and have helped them with one-off issues from time to time. This is obviously a great opportunity and one that I definitely want to pursue, but I'm not sure how to best structure it so that it's fair and beneficial for everyone. They've floated the idea of financing the properties through them so I don't have to come up with a massive downpayment, etc. so I think that's the route that makes the most sense. I'm just not sure how I go about figuring out all the specific details. For example, some of the houses have a mortgage, some don't. Do I create a hypothetical mortgage and pay them back based off of that? How do we figure out the sales price for each house when I go to actually purchase in the next few years? This is definitely not my strong suit, so any guidance and thoughts would be appreciated. I figure you have to start somewhere, so here I am! Thanks in advance!