William has decided to purchase a large apartment complex. He pays $100,000 cash, obtains a loan on the property for $500,000, and assumes the first mortgage balance of $250,000. He also gives the sellers $100,000 of marketable securities that he purchased three years ago for $125,000 and paid a finder's fee of $5,000, legal fees of $6,000, and transfer taxes of $12,000. What is William's acquisition basis for the building? Does he have any other tax consequences as a result of this purchase?