Cummings Properties has announced a new, 21,300-square-foot lease at TradeCenter 128 in Woburn with McLane, Graf, Raulerson & Middleton, reportedly the largest law firm in New Hampshire.

According to Cummings Properties account manager Shannon Haines, McLane opened its first Woburn office in 2008, occupying just 1,700 square feet. The firm’s newest space is in the same building at the landmark TradeCenter 128 campus, immediately adjacent to the Middlesex Superior Court. Located on the seventh floor, it will feature an 80-seat conference center and views of the Boston skyline.

The recent addition of attorneys and staff brought McLane’s current office to maximum capacity. Anticipating more new hires in 2013, the firm decided to embark on its fourth expansion in four years.

Mike McCluskey, McLane’s executive director, said, “Over the years as we grew, Cummings Properties worked with us several times to allow for expansion. It has been convenient to grow in the same facility without moving to another building.”

Currently, 17 attorneys work at McLane’s TradeCenter 128 office, while many more split their time between Woburn and the firm’s Manchester, Concord, and Portsmouth, NH offices. The Woburn location focuses on corporate and tax matters, as well as estate planning, trusts, real estate, and business litigation.

According to McCluskey, “A key part of our growth is our location outside of Boston, which positions our firm as a better value, since we do not incur the high costs of being located downtown. A lot of clients started to push back on the high rates of Boston firms and were willing to give us the opportunity for business.”

Noting that TradeCenter 128 is at the junction of Interstate 95 and Interstate 93, he added, “We are strategically located so that our attorneys and clients can get here quickly. The free parking is an added bonus.”

Haines said, “Being accessible to the highways and sharing a campus with the Middlesex Superior Court have made TradeCenter 128 a prime location for attorneys. We now have 13 law offices in the building.”

The future looks good for McLane in Massachusetts, according to McCluskey, who said, “When looking at the financials year to date, we see a 20 percent growth in revenue over the same time last year, and we expect it to get stronger during the year.”