Despite a lack of success on the floor and turmoil off the court, the New York Knicks are the NBA's most valuable team for the fourth consecutive year.

The Knicks are worth $613 million, according to Forbes' latest rankings, an increase of 1 percent over their 2007 value.

For the fourth consecutive year, the Los Angeles Lakers are ranked second by Forbes, at $584 million, up from $560 million.

Rounding out the top five are the Chicago Bulls at $504 million; the Detroit Pistons at $480 million; and the Cleveland Cavaliers at $477 million.

The biggest change in value belongs to the Portland Trail Blazers, who increased by 21 percent to $307 million. They still rank only 20th out of 30 franchises.

Also showing a huge increase are the NBA champion Boston Celtics, up to $447 million from $391 million.