A teleconferencing center is relocating its operations and its 65 employees from downtown Lawrence to East 23rd Street.

An official with Connex International confirmed the company is moving from its 10,000-square-foot office at 947 Mass. to a 15,000-square-foot office in the 10 Marketplace development on the northeast corner of 23rd and Harper streets.

Dom Mercurio, controller for Connex, said the company hoped to move its operations by the end of September. He said the move would allow the company to expand the number of work stations it uses to facilitate conference calls for larger companies.

The company plans to expand from 50 work stations to 100 work stations and during the next two years add about 45 employees. Mercurio said the company was expanding to keep up with an increase in demand since Sept. 11 and the ensuing decline in the stock market.

“During these tight economic times, I think companies are starting to realize that teleconferencing is a more economical way to conduct meetings,” Mercurio said. “And after Sept. 11, with all the issues about flying, we’ve seen more people turn to teleconferencing. It’s helped our business.”

Connex located in Lawrence in the late 1980s, Mercurio said, and the location grew to be the largest teleconferencing center for the Danbury, Conn.-based company.

The center handles about 150 teleconferences a day, and Mercurio said that number might double with the expansion. The company didn’t release the names of its clients, but Mercurio said it routinely handles conference calls for several publicly traded companies that use the system to release their quarterly earnings to analysts and the media.

The company also provides teleconferencing services for firms looking to have internal company meetings without incurring the travel costs to meet in person.

The company doesn’t release wage averages for its employees, but Mercurio said the new positions would be competitive for entry-level jobs in the Lawrence area. He also said the new positions would be a mix of full-time and part-time jobs.

Mercurio said Connex is trying to sell its downtown building. He said the company had received interest from several developers looking to convert the three-story building into everything from retail to office to apartments.