In response to rising rents and hot investor activity, National Development is attempting to unload a six-building portfolio in Boston’s Fort Point district.

The assets, totaling more than 407,000 square feet of office space, are in the so-called Innovation District, where some rents have jumped significantly over the last year, more than five percent in some places.

Industry sources have told Banker & Tradesman the buildings could fetch $120 million. The brick-and-beam portfolio includes 33 to 41, 34 and 44 Farnsworth St.; 332 and 374 Congress St.; and 263 Summer St., the property topped by the recognizable Boston Wharf Co. neon sign. Potential buyers include Beacon Capital, Shorenstein Properties and DivcoWest, sources have told Banker & Tradesman.

The sale is being pushed especially by the recent investor activity surrounding the Brickman portfolio, a four-building, 362,000-square-foot office portfolio in the Fort Point district that DivcoWest has under agreement for upwards of $105 million.

"[The Seaport] is a very exciting and dynamic market right now with a tremendous amount of investor interest," said Thomas Alperin, president of National Development. "Given the level of acitivity and pricing on [the Brickman portfolio] … that made us take a hard look at considering selling our assets. It’s an institutional-profile group of assets and there’s a lot of capital chasing good quality assets right now."