Ventana Medical Systems will sign on as lessee in a new business park in Marana.

The company will move its distribution operations from near Tucson International Airport to a custom-built, 60,000-square-foot facility just west of the Tangerine Road and Interstate 10 interchange.

The move will locate the company's distribution center closer to its main center of operations.

As one of Tucson's largest private employers, Ventana employs about 1,200 people at its main campus in Oro Valley, and another 40 in its distribution center.

Ventana builds tissue-based cancer diagnostic tools, and is a member of the biotech company Roche Group.