The party’s over at the mayor’s house.

The annual gala that raked in hundreds of thousands of dollars in donations to benefit Gracie Mansion disappeared after Bill de Blasio became mayor.

As a result, donations to the Gracie Mansion Conservancy, charged with maintaining and preserving the historic property, dropped by 90 percent last year, its latest tax filings show.

The nonprofit took in only $67,567 in contributions in the fiscal year ending June 30, 2014, down from $641,140 the year before. Most of the 2013 revenue came from the annual spring gala.

It got another $67,092 in revenue last year from tours of the Upper East Side mansion, a program that has been on hold since de Blasio and his family took up residence there in July 2014.

With the drop in revenue, upkeep of the 1799 manse took a big hit. The conservancy spent just $143,634 on restoration and maintenance last year, down from $928,429 the previous year, according to its tax filings.

The conservancy doled out $67,183 in salaries, including $19,780 to director Meredith Horsford for her two months at the helm of the nonprofit in the last fiscal year.

Horsford resigned in December citing family obligations. She was replaced this month by Paul Gunther, a former executive at the New-York Historical Society.

The conservancy didn’t pull in enough money last year to cover its expenses, which totaled $404,201. It made up the gap from a $2 million reserve fund.

Yet a spokesman for de Blasio said the fund-raising galas were scrapped because there was no need for them.

“There are currently no Gracie Mansion programs requiring outside funding. For potential programs or initiatives moving forward, there will be corresponding fund-raising,” said the spokesman, Peter Kadushin.

He said current roof repair and asbestos removal at the home were being paid out of city funds allocated during Mayor Mike Bloomberg’s administration.

Bloomberg didn’t live at the mansion, preferring his Upper East Side town house but spent millions of dollars of his own money to restore the property.

He hosted the annual gala for the conservancy for many years. The parties typically featured food from such tony city restaurants as Nobu and Le Bernardin and attracted boldfaced names.

When de Blasio and his family moved into Gracie Mansion last year, they packed away some of its historic furnishings in favor of more contemporary pieces donated by West Elm. The Brooklyn-based company provided $65,000 worth of goods.

The city installed a higher privacy fence around the property after sources told The Post the mayor was tired of gawkers.

Mayor Rudy Giuliani and his family lived at Gracie Mansion, and his wife, Donna Hanover, chaired the conservancy board.

De Blasio’s wife, Chirlane McCray, has no role on the board.

Additional reporting by Caitlin Smith