With the federal government shutdown reaching the 30-day mark, the first rental payment since federal workers stopped receiving pay is about to come due. Thousands of D.C.-area renters will have trouble making it.

After Friday, unless a deal is reached, employees at every civilian government agency will have missed a paycheck.

The D.C. region is especially vulnerable, housing about 15% of the country’s federal workforce. There are more than 356,000 federal workers spread across the area, and a quarter of all jobs in the District are federal jobs.

The economic ripple effects of the shutdown are expected to hurt the region’s rental housing market. From federal workers going without pay to low-income tenants not receiving voucher payments or food stamps, the industry is warning of a risk that a wave of tenants will default on November rent.

“We’re at a critical moment right now where they need to open up the government, because once we cross those thresholds where those pools of money dry up, then that’s going to be catastrophic,” Capitol Rock Partners CEO Felipe Ernst, whose firm owns more than 30 apartment communities in the region, told Bisnow.