HOW SEVERE is Philadelphia's blight problem?

Look no further than the block of Glenmore Avenue above 61st Street in Southwest Philly. A family of five was displaced late Sunday night there when the back wall of a rowhouse collapsed and the building's guts spilled into the overgrown yard leading down to the train tracks.

Yesterday afternoon, the kitchen sink was dangling precariously over a pile of bricks and wood.

"Thank God there were no injuries," said Scott Mulderig, who oversees the emergency-services division of the city's Department of Licenses & Inspections.

But the collapse is just a symptom of a larger problem on Glenmore Avenue.

When L&I officials got to the scene, they identified at least 16 other homes as unsafe or imminently dangerous - on that block alone.

"We're trying to take a more proactive approach," Mulderig said. "We're going to start taking a look at entire blocks."

L&I scrambles year-round to demolish hundreds of blighted homes before they collapse, but the list of imminently dangerous buildings keeps regenerating. At least eight buildings unexpectedly collapsed in February and March.

The Glenmore Avenue rowhouse that collapsed Sunday night had received dozens of L&I violations dating back to 2006. Mulderig said L&I had not been able to reach the owner yesterday.

"The owner happens to be an LLC that only has a P.O. box," he said. "That makes it very difficult for us."

Thomas Goldberg, 60, a lifelong resident of the block, said he believes that the Amtrak trains running directly behind the homes have caused damage over the years. His porch roof is partially caved in.

"The railroad did all this. No doubt about it," Goldberg said, as he pointed down the street to a row of homes with fluorescent orange L&I violations on their doors. "It's like a rocket going by, and your whole body is shaking."

Many of the homes, however, are abandoned. Mulderig said neglectful property owners, some of whom don't even live in the area, are a major cause of the city's blight problem.

"We keep stressing that people need to repair their properties," he said. "Maybe people will start listening."

About 90 minutes after Mulderig spoke, a building on Sydenham Street near York in North Philly partially collapsed. No injuries were reported.

- Staff writer Vinny Vella

contributed to this report.