Trivia: The bar "Mahoney's" is named after the late John Mahoney, who played Frasier's father in the original show.
Trivia: The first episode "The Good Father" is named as a nod to the title of the first episode of the original series: "The Good Son".
Trivia: David Hyde Pierce chose not to reprise the role of Niles, saying "I love those characters, but I don’t miss them."
Answer: He wanted his father to believe that his life was more "stable": his own apartment, a serious/committed girlfriend.