Suffolk University has sold its six-story Fenton Building on Beacon Hill for $15 million.

The buyer was 32 Derne Street LLC, an affiliate of Brookline-based Derne Street Partners.

The university plans to move classrooms and administrative offices that were located in the 47,480-square-foot Derne Street building to other parts of campus this summer and eventually to the new $62 million 20 Somerset building under construction.

Frank Petz of JLL’s capital markets team led the transaction on behalf of Suffolk University.

"This offering gave investors the rare opportunity to purchase a quality asset in one of Boston’s most sought after neighborhoods," Petz said in a statement. "Investors responded enthusiastically to the building’s potential for redevelopment, expansive floor plates, unusual height for its surroundings, superb window line, and views over Beacon Hill to the Back Bay and Charles River."