he bought the property on a whim to live with Mandy Moore's character, and since she was only guest star for a couple episodes, they broke up and he never built the house.
He couldn’t afford to build a house. But honestly, he should just let those rent the property for parties. Charge 10 bucks a head, unofficially of course. Could make easily 200-400 bucks a night. And if they wanted to go every night, he’d make any where between 1400-2800 a week. With that extra money, he rent a great apartment or even use that for a down payment for a house.