Seller Finance Question

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I am looking at buying a deal through seller financing through a property management company. The only other seller financing deal I have done is on my primary residence, and we went to a closing at a title company. So I am slightly confused. This property management company said for me to look at the property and have an inspection done, then if I am interested they will send me a contract to review (and they suggested that I have a real estate attorney look at it). Then if everything looks good, to sign the contract, provide the down payment and I will be given possession of the property. They said the closing would be when the property is paid in full (10 years). I confirmed that it is not rent to own or lease, the seller is financing the whole amount minus down payment ($77,000 is the financed amount). I would be responsible for taxes and insurance. So my question is, would you guys go through with something like this? The property needs work so it wouldn't be able to be financed by a bank. Would a signed contract keep the seller from selling the house from under me or getting a mortgage on it? My fear is that I buy this and later on something like that occurs. How could I protect myself from that? Thank you in advance for any help!