Therefore the foundations had to be set very deep, to guarantee a safe and stable building.

It's basically a safe building but the allowance for sway was much greater.

For two years volunteers worked hard to make the building functional and safe.

"We don't believe sprinklers are necessary to have the safest buildings."

It is considered one of the safest buildings in Mexico City and the world.

So it must be the case that you are paying for a nicer, more functional and maybe even safer building.

People are saying this is not a safe building.

Do you think this is enough to provide safe buildings for children?

It would "probably be the safest building in the world," he said.

Several others said they would prefer to spend the minimum possible to do the basic work needed to make the building ready and safe for workers.