It helps not to use the word "worth." Take it one fact at a time.

They put money into the Partnership.

That's now an Asset = money. There is no Cost for that. It's just money. Nothing was bought or sold, yet. And there is nothing to amortize or depreciate. It's still there, as money. They didn't start anything, yet; there are no activities.

Then, they bought a building, so one asset (money) turned into another (Real Estate) and there is debt for the balance owed. That is Cost, or Basis, in the building. Not "worth."

And make sure to separate assets by class: Building, Land, outbuilding, improvements (parking, fencing?). That total Cost bought stuff and there it is, invested in that stuff.