Try negotiating the offer price to reflect the repair cost of the sewer line.

Comps for predominantly rental areas are driven by the income it generates & market sales reflect the proper usage of the property, vacant or occupied. 

What seems of utmost importance is reflected in the old saying 'You make your money when you buy'. 

Should I have the Purchase Agreement re-submitted to reflect the new dates?  

How would it reflect and where would it on their financials.

You will get this later in life when you reflect, and realized that you have barely scratched the surface of this thing called life.So, while your contribution is welcomed, maybe practice on your delivery would be helpful. :)

Its reflected in Dodd-Frank, ADA, Fair Housing, local eviction laws, Etc - all of these came about because of a small group of people abused others to such an extreme level that the gov't swoops in and decides protections are needed and they go to the opposite extreme in their policies.

That leads to fewer maintenance costs and longer occupancy.Each of those factors will absolutely effect the long-term performance of any property - not just a Turnkey property.Lastly, if you want to just cut straight to the chase about returns,  expect to lose 50% of your rents annually and reflect out over 10 years.  

I've revised my spreadsheet to reflect the input on CapEx and PM from everyone on how to value these properties. 

Depending on the custodian, they may want to see the LLC amended to reflect the Roth IRA as the member.The lenders would likely want to re-do the loan paperwork as well.At the end of the day, whether the investment asset is stocks or real estate, the concepts and benefits of a Roth conversion are the same.