NEW YORK - Mayor-elect Bill de Blasio has announced five more key members of his administration as he prepares to officially take office.

Bob Linn was introduced as the new director of labor relations, a position that will have him tackling contracts between the city and unions, while Stanley Brezenoff will take over as special advisor to the first deputy mayor specializing in labor contracts.

Officials say Lin has an especially tough road ahead of him because every municipal labor contract needs to be renegotiated.

De Blasio also named Polly Trottenberg the head of the city's Department of Transportation, while Gilbert Taylor takes the lead at the Department of Homeless Services.

Kyle Kimball will remain as head of the Economic Development Corporation.

De Blasio will officially become mayor of New York City at a small swearing-in ceremony being held at his home around midnight. A larger public ceremony will take place at City Hall tomorrow, which will be aired live on News 12.