This will protect both of you in the event something happens with the sewer line; who is responsible for the repairs and cost.  

I did not receive any sleep that night and I had strongly felt that the new management had failed in its number one priority: to provide a secure living space for its residents which is protected under the implied duty of habitability.

Discusshttps://wtop.com/dc/2020/01/dc-lawmaker-hopes-bill-will-protect-affordable-housing-and-increase-tenant-protections/

Nothing protects against risk better than scale.

There is nothing really much you can do, besides using trusts and other asset protection techniques to hide your personal name from the property.

I would recommend getting a Warranty or Special Warranty Deed if you can to protect your interests in the asset so you can keep it. 

They'll be able to help make sure you are protected and clearly understand anything else that may pop up through your partnership.Let us know how it goes!

There may be asset protection benefits to the investor to purchase the property as entity.

This will keep the cost down on the initial inspections, but still gives you protection if something is found. 

You could make an offer with a due diligence period to give you a chance to get inspections, and check for any environmental issues (cars leaking fuel, oil, etc... could be an issue).