Investors & landlords

Because your mom lived in it and essentially had full use and benefit of the home the entire time, this sounds like a "Life Estate".

 

That would mean the house gets a "step up" in Basis, which means your 'purchase' price is the Fair Market Value on the date of her death.

 

There is a section to sell investment items, such as Stocks, Bonds, etc.  The sale of the home will be entered in that section.