At least 16 higher-end New York hotels have quietly begun imposing a mandatory $25 nightly "destination fee."

Hotel operators say the fees cover additional services and amenities, but some guests are complaining they are hidden and unwelcome costs.

Last August, Marriott International started what it called a pilot program, charging the fee at 13 hotels, including the New York Marriott Marquis, Sheraton New York Times Square, Westin New York Grand Central Station and JW Marriott Essex House.

Hilton began its destination-fee program at the New York Hilton Midtown and the Doubletree by Hilton Times Square, while Hyatt instituted the fee at the Grand Hyatt New York.

In each case, the fees are subject to both local and occupancy taxes.