Entirely possible and even probable that a zero point energy weapon was used. Nothing else explains the melted door handles on vehicles parked down the street away from the collapse, while the rest of the cars were relatively untouched. The intense prickly sensation and heat from this energy would send a person right out a window to escape it.
Nukes work differently though. You're not wrong, but zero point energy creates a sustained electromagnetic field that resonates with a specific vibrational frequency. Everything living or otherwise has its own unique vibrational frequency. Find the frequency that matches the buildings material(s) and you can destroy those materials. Tesla almost collapsed his apartment tower with a device no bigger than a textbook. How? He found the buildings precise vibrational frequency.