SCHENECTADY —The demolition of at least one home on Barney Street will likely start Monday after a hillside gave way, sending earth and trees into another home below.

A man in an apartment at 223 Nott Terrace was partially buried after the mudslide happened around 1:16 a.m. Sunday, with emergency crews using shovels and other equipment to dig him out. The man, who police have not identified, was flown to Albany Medical Center Hospital. The extent of his injuries are unknown.

The hillside at the end of Barney Street crushed the back of 223 Nott Terrace, causing an outer wall of that building to visibly bow outward. Meanwhile, the house at 15 Barney Sunday was suddenly poised on the edge of a cliff after the ground had given way. Part of what looked like a metal fence to protect the hillside from erosion had also tumbled down the embankment.

The hillside also shifted underneath the foundation of a three-car garage across from 15 Barney Street.

Schenectady police put out a notification Sunday afternoon that Mayor Gary McCarthy had declared a state of emergency in the area at 9:45 a.m. The declaration covers 213, 219, 223, 225 and 227 Nott Terrace, as well as 11 and 15 Barney Street and 2 Daggett Terrace.

The state Department of Homeland Security and Emergency Services was also at the scene Sunday.

Demolitions are likely necessary for 15 Barney, which appeared vacant, and the home on Nott Terrace that was hit by the mudslide.

Nott Terrace is closed between State and Chapel streets until further notice. National Grid crews were on scene Sunday for most of the day.

Deputy Schenectady Fire Chief Don Mareno said the cause of the slope failure is still under investigation.

"The situation is under control, no one is in danger at this time," he said.

Mareno said, "it was an extensive extrication" to assist the gentleman buried after the mudslide invaded his apartment. Approximately 20 firefighters responded to the scene.

There were approximately 10 other people in the house, Mareno said. Some made it out on their own, others needed assistance, he said.

The American Red Cross said 21 adults from 213, 223 and 225 Nott Terrace were impacted by the mudslide, which forced the evacuation of residences.

“Our guys, along with the police did a fabulous job,” he said. “Because that’s one of those things you don’t run in to every day. You gotta depend on your training and your instinct because it was dangerous in there.”

The mudslide was similar to another that happened in January in Schenectady in 1996. During that event, a slope between Summit Avenue and Broadway failed at the I-890 exit 5 off-ramp, sending earth and trees onto a gas station below. One man was killed, and two others were rescued from the dirt unharmed.