WASHINGTON — The nation’s top law enforcement agency will continue operating out of its deteriorating downtown Washington headquarters for the foreseeable future after the federal government announced Tuesday it had scrapped a decade-long plan to look for a new building in Maryland or Virginia.

The General Services Administration, which oversees federal office space, said it does not have enough money to move forward. The Obama administration had sought $1.4 billion for the project, but Congress left it underfunded by about $882 million.