PC-maker Lenovo has leased an additional 70,000 square feet of space at its Morrisville campus to accommodate its rapid-fire growth.

The company, which is announcing its expansion Friday, has been cramped for space as its local workforce has surged to 2,000, up from 1,550 in mid-2009. Lenovo is based in China but has its executive headquarters in Morrisville.

Lenovo’s local expansion has been fueled by the company’s exploding sales: It has been gobbling up market share as the fastest-growing major PC-maker for 10 consecutive quarters, making it the world’s No. 2 PC-maker. For its fiscal year that ended in March, revenue rose 37 percent to $29.57 billion.

“This expansion not only gives our employees extra space to work, collaborate and pioneer new ideas, it also positions us for future growth in North Carolina,” Rob Cones, Lenovo’s site executive, said in a statement.

Spokeswoman Kristy Fair declined to discuss future hiring plans.

Lenovo intends to start moving into the new space on two floors of the third building on its Morrisville campus, in the Perimeter Park office complex, in July. That will give the company, which already fully occupies the other two buildings on the campus, a total of about 470,000 square feet, said Jeff Sheehan, senior vice president at Duke Realty, which owns Perimeter Park.

Duke developed Lenovo’s campus after the company acquired IBM’s PC business in 2005. The original plan called for Lenovo to occupy all three buildings, but Lenovo switched gears and renegotiated its lease in 2009, a time when its business was struggling.

Lenovo is moving into space previously occupied by email marketing company iContact, which until recently was one of the Triangle’s fastest-growing technology companies. Maryland-based Vocus acquired iContact at the end of February and shortly afterward initiated a major round of layoffs.

Sheehan said iContact is moving into significantly less space – 21,000 square feet – elsewhere in Perimeter Park.