Sony Email to All Employees about Its Tokyo Headquarters

According to the email, the Sony headquarters is

...is built like a fortress with tsunami barriers that rise in front of the building to protect it from flooding, and will continue to be our central command post as we fight back together from this devastation.
…
After the quake, more than 1100 Sendai employees, together with another 100 neighbors, were trapped on the higher floors of our building, but as of today, that number is down to approximately 10. Water levels are now down to a thick layer of mud. We sent in helicopters to deliver water and other basic necessities, and the damage is being assessed.

(ViaFT)