Humane officials and horse owners worked well into the night on Thursday to remove horses from condemned buildings in Philadelphia’s Strawberry Mansion in advance of the structures’ scheduled demolition.

“The horses are being removed as we speak,” said Lisa Rogers, director of outreach for the Pennsylvania Society for the Prevention of Cruelty to Animals (PSPCA). “We have offered our trailers to help move horses for owners if they do not have trailers to do so.”

According to Roger, 60 horses–all privately owned–had been living in filthy conditions in four buildings in the North Philadelphia neighborhood. Two of those buildings are slated for demolition March 10; a third will be demolished within 30 days.

The conditions the horses were living in came to light in November when three horses were found dead in the stables and surrounding area. The structures were subsequently condemned by city health officials for a range of health and building code violations.

But while they had months to find alternate accommodations, many owners did not remove their horses until officials gave them 24 hours to relocate them, Rogers said.

Horses not removed by Friday will be removed by the PSPCA. Those not claimed by their owners at the time of demolition will be considered abandoned, and fall under PSPCA custody.

“Depending on the assessment of our Director of Animal Health, abandoned horses will either be put in foster care or up for adoption,” Rogers said