The man who killed four in a mass shooting at 345 Park Avenue bought the gun from his supervisor at a Las Vegas casino.

BREIT CEO Wesley LePatner was among those killed in the shocking attack, plus more New York City real estate news.

The day after NYPD Detective Didarul Islam was laid to rest, he'll be remembered with a vigil at the precinct where he worked in the Bronx.

The Las Vegas casino security supervisor who sold the assault-style rifle used in Monday's mass shooting in a Park Avenue office building complied with the law, his attorney said.

There were 23 shell casings and 13 bullet fragments recovered from the lobby of 345 Park Avenue and 24 spent shell casings on ...

Roger Goodell was emotional on Thursday as he publicly addressed the deadly shooting that took place inside 345 Park Avenue, ...

Sebije Nelovic always felt safe at 345 Park Avenue. For nearly three decades, she cleaned the ritzy Manhattan skyscraper in ...

A security expert offers a list of ‘must-haves’ for workplace safety that may save lives in the event of a mass shooting.

After a deadly shooting at an NYC building that housed NFL and Blackstone offices, safety experts say it’s high time ...

It was just after 1:30 a.m., and Jessica Tisch was walking the eerie quiet of 345 Park Avenue, surveying the detritus of a deadly attack.

Most of the damage was relegated to the 33rd flood, where Shane Tamura accidentally rode the elevator while searching for the ...