The parent must file a gift tax return annually, and any remaining balance is included in the estate.If the home was your primary residence for at least 2 of the last 5 years, you may exclude up to $250,000 ($500,000 if married filing jointly) of capital gains from taxes.

Check out traceestate.com I have been using them and the sourcing company that they incorporated for the last few years.

It may be challenged to out produce the lifetime S&P.  I

If you let them go, they will pay you last.

@Greg P.  I

Lastly, talk to your realtor about the misrepresentation.

About how they saved $6,000/yr for the last 10-20 years.

The market has been incredibly robust the last few years and I don't see that changing anytime soon especially as mortgage rates continue to decrease.

Where are your scheduled gross rents and effective rents so far in the last T12 months so we can figure out offense and defensive strategies.These would be the questions we'd go through in planning your steps ahead.

Quote from @Nate Sanow: Yes I own two that are near 100 years old and I will tell you they are a pain in the you know what compared to all of my post WW2 properties especially post 1980… layouts are better in the last 50 years and energy efficiency is better and I can keep going… HOWEVER to reply to the other aspect of your question, I’ve found appreciation is better with older properties in areas of the path of progress.