Answer:
Jonas must recognize a long term capital gain = $680,000 - $500,000 = $180,000
Since this gain is originated from the sale of a property, it will be considered a capital gain. If the property was held for less than a year before it was sold it would be considered a short term capital gain, but in this case the property was held for 9 nines, therefore, it is considered a long term capital gain.