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In one of the largest office lease transactions in Northern Virginia so far this year, Alarm.com has increased its corporate headquarters space at The Boro in Tysons, Va., by 30 percent. The Meridian Group is the property’s owner.

The transaction, arranged by Avison Young, was a long-term renewal lease of 189,000 square feet and a new lease for an additional 57,000 square feet for a total of 246,000 square feet.

With the expansion, Alarm.com, a technology company specializing in property security, will be the sole tenant of the building at 8281 Greensboro Drive. The firm’s latest expansion marks a 300 percent increase in office space since its initial 82,000-square-foot lease signed in 2014.