While you clearly have an economic loss, tax rules prevent you from deducting the decline in value from your $120,000 purchase price to the value at the time you converted the condo to rental property. What’s more, depending on the amount of depreciation claimed on the condo from the time of conversion, you may actually have a tax gain (even though you have a financial loss). Talk with a tax pro to run the numbers in your situation.
Increase in value of property due to market conditions. When you sell appreciated property, you pay tax on the appreciation since the date of purchase. When you donate appreciated property held long term, you may generally deduct the appreciated value.