Will the IRS Say It’s a Gift, If I Sell My House to my Son at a Great Price? – Annapolis and Towson Estate Planning

My wife and I have agreed to sell our house to our son. The bank-appraised value of the property is $700,000 and we are selling it to him for $340,000, which is the amount of the mortgage. How will the $360,000 be treated and are there tax consequences?