The Department of Housing and Urban Development said it was reviewing all aspects of the Biden-era program to ensure it was carried out consistent with the agency’s core mission.

Earlier this year, everything seemed set for a major renovation to make two Chicago apartment buildings for mostly lower-income elderly residents more energy efficient. An affordable-housing organization had secured a federal loan, a state loan and money from private investors.

But the project, which was to start in a few weeks and include the installation of solar panels, is on hold after the federal Department of Housing and Urban Development delayed funding a critical $5.4 million loan that it had previously approved.

“Things are in limbo,” said Aaron Gornstein, chief executive of the Preservation of Affordable Housing, a Boston-based firm behind the Chicago project that operates in more than a dozen states. “Everything has been held up.”

Housing advocates say the industry has received no

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