Brightcove, a high-tech company offering an online video platform for websites, is set to occupy 80,000 square feet at Atlantic Wharf in Boston, according to senior industry sources.

The firm is looking to vacate its approximately 30,000-square-foot One Cambridge Center home late this year to expand the rapidly growing company, sources said. Brightcove officials declined to comment for this story.

The company’s rent is now in the $50 to $60 per square-foot range and will drop to the low $40s, according to those sources.

"What’s most interesting about it is that this is a tenant coming out of Cambridge [more than] doubling in size, and there’s been several of them that are coming over from Cambridge or Watertown," like Communispace, which is relocating to about 82,000 square feet at Atlantic Wharf from Watertown, one industry executive said. "This is a clear indication that there are tenants growing out there."

One of the biggest and most welcome surprises about the Financial District’s new Atlantic Wharf development is that the building’s Waterfront side, where the historic warehouse façade was preserved, has attracted tenants like Brightcove and Communispace, both high-tech companies, said another source.

"It creates more activity for the Waterfront, Seaport and the CBD by bringing all these facets together, and therefore helps support a lot of the ancillary businesses," Benjamin Heller, executive vice president at Jones Lang LaSalle, told Banker & Tradesman.