ST. LOUIS • Someone stole thousands of dollars worth of equipment Habitat for Humanity St. Louis was using to build a home for a working mother of two, according to the organization.

A trailer filled with tools went missing at the work site between Sunday evening and 6:30 a.m. Monday , the nonprofit announced in a press release Monday. The trailer was later found near Gasconade Street and Iowa Avenue, but many of the most expensive power tools and other equipment were missing.

All the tools and the trailer and other equipment originally taken were valued at about $75,000, the organization said. The equipment still missing is worth $15,000 to $20,000.

The stolen tools were needed to build a home at 7600 Vermont Avenue in the Patch neighborhood. The home is being built for a single working mother of two young children, wrote the organization’s CEO Kimberly McKinney in an open letter to the thief.

“She has been sacrificing her free time and weekends to work at the construction site so she can buy the home being built where you trespassed,” McKinney wrote.

The nonprofit hoped to complete construction before Thanksgiving so that the family could spend the holiday in the home.