The Northern Virginia office market consists of 1,529 buildings, over 25,000 square feet, totaling approximately 188.6 million square feet of rentable space. The largest private sector lease signed during the first quarter was a 180,000-square-foot relet by Microsoft at Commonwealth Tower – 1300 Wilson Boulevard. The largest lease signed by the GSA, and the second largest of the quarter in Northern Virginia, was a 70,297-square-foot relet by the GSA-Department of Defense at Heritage Center 4 – 7619 Little River Turnpike. Building sales volume totaled $96,466,960 during the first quarter 2021. The largest transaction was the sale of Mark Center 2001 – 2001 N. Beauregard Street in the I-395 Corridor submarket.