people to say, you know, we have this explosive event threat that's been identified by urs, we have thomas seteyb one of the premier engineers in the world. let's look at possible damage. we like to compete with each other and bring different viewpoints to the subjects because that's our responsibility. >> bob, can i, just top to be helpful with time can you go over the budgetary recommendations. we can go through all the dooms day scenarios. but we are more interested in the fs fiscal lens of this. >> we've had a series of threats, from a budget perspective. there are relatively and were relatively minor structural enhancement required because the building was extra ordinarily robust. as the building begins to move, the structural design of the building had to take into consideration. there were recommendations made with respect to the steel members and the cast notes in an attempt to optimize the cost. we worked with kelly adam son team and partners, we attempted to identify in the glass design of the building ways to find a means to make that glass facade as safe as possible and material conne