Work was winding down at 345 Park Avenue on Monday when a man strode across the public plaza just outside the Midtown Manhattan tower with an assault rifle in his hand.
Within minutes, at least four people were dead, as well as the gunman, in a mass shooting in the epicenter of American finance. The harrowing scene unfolded in the 44-story, dark-glass tower that houses the offices of private equity behemoth Blackstone Inc., consultant KPMG, building landlord Rudin Management and the National Football League.
Shane Tamura, a 27-year-old who last resided in Las Vegas, shot and killed a uniformed police officer in the lobby and made his way to the 33rd story befo…