Cubellis, a top-earning international architecture and engineering firm headquartered in Boston, has closed.

The 23-year-old firm, which has 12 offices, including one in Dubai, told its employees of the shutdown the day before Thanksgiving, according to the Boston Business Journal, which first reported the news. In 2008, the firm came in 60th out of the U.S.’s 250 most-successful firms, with revenues of $51 million, according to a survey by Architectural Record.