-: My name's Mario Zacharjasz and I'm an architect.
I'm a principal at PZS Architects.
Sometimes if you're working on a particular building
that's existing, for example, and your renovating it,
and you're changing what was in there from before,
you may run across an unforeseen condition.
Something behind a wall or under the floor
that no one knew about before.
Those are things that pop up and could delay the project
or could be handled very easily.
Could cost more money or could be a credit
depending on what it is.