Robert Hess leaves two trash bins outside his house: one for his family and another for Rowan University students who live nearby.

A few years ago, his son, then 5, was playing barefoot in the front yard when he stepped on a broken bottle, presumably left by an inconsiderate student. "I remember pulling glass out of his feet," Hess, 38, said Tuesday.

His situation reflects the relatively new reality Glassboro residents face.

While the borough trumpets redevelopment efforts and new attractions downtown, students are increasingly living in the town's residential areas - partly as a result of the construction. That has inflamed tensions between longtime residents and the students, with whom they had limited contact in years past.

Some students say they have tried to strike up a rapport with their neighbors, who they say tend not to reciprocate. The police chief suggests the perception of wildly unruly students is overblown.

Construction of Rowan Boulevard - which links the campus to downtown and is the site of a new Barnes & Noble bookstore and a planned hotel - required tearing down some private student housing.

So where the parties and loud music typically associated with college students were once mostly confined to areas away from other neighborhoods, young people now are scattered all over town, and they've brought their music and booze with them.

"Glassboro is being reinvented with Rowan Boulevard. With that said, this is a growing pain that's part of that," Police Chief Alex J. Fanfarillo said. "We're saying to people, 'Please walk our streets again.' The students are glad to walk them. But some older citizens, citizens who've been in the neighborhood 20, 30 years, are saying, 'Wait a second. I've never seen this before.' "

As Rowan continues to grow, investors are buying properties and renting them to students at a rate not seen before.

"There's definitely been an increase in student rentals," said Adam Szyfman, who rents eight apartments and four single-family houses to students and has been renting since 2005.

"As a landlord, I'm looking to gobble up as many as I can," he said.

Of course, town-gown quarrels are nothing new. But "it's unique to be happening at this time" in Glassboro (population 19,000), Fanfarillo said.

The Police Department in September hired six new part-time officers to patrol affected neighborhoods from Thursday through Saturday nights. Rowan is splitting the $88,000 cost with the borough.

The officers' task is twofold to make their presence known and respond to incidents. Parties are no longer the main source of complaints, Fanfarillo said. Rather, it's the noise that groups of students make walking from house to house on weekends.

Accordingly, the officers travel by foot and are "implanted into hot spots," he said.

The borough also holds quarterly meetings for residents and students so it can address problems. Residents said the meetings had helped. The new police hires resulted from such meetings.

About 1,500 to 2,000 students, or 14 percent to 18 percent of the undergraduate body, live off campus in any given year, Rowan spokesman Joe Cardona said.

Gloucester County Freeholder Heather Simmons, a spokeswoman for Glassboro, said a developer built an apartment complex on Rowan Boulevard in 2009 that the university leases to accommodate 1,200 students, reducing the number who need to live in the neighborhoods.

Neither Glassboro nor Rowan tracks where students live off campus, so it's impossible to know how many are living in areas students had not occupied before. But Fanfarillo said that on Victoria Avenue alone, a few blocks from campus, 17 of 30 properties are rentals.

On a drive along Victoria - near where Hess lives - Tuesday morning, students were walking to and from class, driveways were packed with four to six cars, and rental notices stood out like lawn signs at election time.

Hess, who earned his bachelor's degree from Rowan in 1997 and his master's there last year, has seen the issue from both sides.

"Overall, the kids are very nice," he said. Late-night partygoers now dispose of their beer cans and bottles in his spare bin, he said, although he still picks up a lot of trash around the neighborhood.

He hopes the expansion of the university and the economic development in the borough will increase the value of his home.

Some of his older neighbors, who lived in the area for decades without the sound of late-night college parties, aren't as sympathetic.

Dorothy Beebe, 70, calls her street "Red Cup Alley," referring to the plastic cups students frequently leave.

She said an inebriated student once stumbled into her home. Another resident said many of her neighbors were afraid to call police for fear of retaliation. She asked not to be named, citing the same reason.

On the other side of campus, Mary Tiscavitch, 21, lives with her baby and parents on Normal Boulevard. She said the increased weekend police presence on her street, which she said has as many students as families, had forced students to disperse.

A few houses down, Tim Vliet, 21, a junior at Rowan, and senior Andrew Cavaliere, 21, said they felt targeted. They said that when they moved into the house last year, they met with neighbors and gave them their contact information in the event of problems.

But they said their good will had not tempered some of their "nosy neighbors."

"They're looking to get us in trouble," Vliet said, adding that he did not feel comfortable inviting a couple of friends over because of possibly hearing from the police. "They want nothing to do with us."