Missing a hand (or a banana) for scale, but that hole sure seems huge.
I don't know much about lightning and such, but shouldn't there had been a rod on your roof, directly linked to the floor, to let all that energy through without breaking the building ?
Anyway, most offices and even particular houses are assured against "natural disasters", so you (your company) should be able to fix that.
My heart already skips a beat when someone sneaks on to me... so a damn lightning...