It's the most emotionally charged building project in the world.

This clearly has to do both, and it's really hard to do both.

The challenge from Day 1 has always been: how do you accommodate both the sacred and the everyday on this site. The memorial needs to function as a solemn and sacred kind of place, while the whole site needs to become part of the city again.

I'd like to tell you we're building a city on a hill, and we may get there, but it's certainly in fits and starts.