New York City’s public housing authority will see at least $35 million less in federal aid this year, in what appears to be the first significant funding cuts to the city under President Donald Trump.

Senior officials at the New York City Housing Authority said the cuts were the largest decrease in funding the agency has seen in five years. Citing conversations with federal housing officials, they said they were bracing for additional cuts that could be far greater, and total $150 million. Shola Olatoye, the agency’s chief executive officer, said a reduction of that size would be devastating.

“The direction we’re moving in is one where public housing is drastically different or doesn’t exist,” she said. “The progress we have made over the course of the last three years—it’s not that it’s at risk. It evaporates.”

The New York City Housing Authority, known as NYCHA, is home to more than 400,000 people, and makes up the biggest single block of affordable housing in the country. About $2 billion of its $3.2 billion operating budget comes from the U.S. Department of Housing and Urban Development, or HUD.

City officials have feared deep cuts to the agency since Mr. Trump’s election in November. In a letter they received from HUD dated Feb. 26, they learned NYCHA’s aid would be slashed by 5%, worse than the 3% decrease city officials had planned for. The agency saw an additional $7.7 million in cuts to federal Section 8 programs from HUD.