eueueueueuhhhh we may both be right.
As evidenced in the circular area - that area on the arch looks like the same brick colour as the building beside it, however the diamond pattern INSIDE the arch looks to be the yellow colour.. perhaps it is a 2 coloured building? You can see the yellowish tan brick right underneath where they filled the cornice in.. I made the circle the yellowish tan colour the bricks might originally be to also offset the orange of that "exposed brick" on the arch inside of it more.
There is one other unsettling option as well - that the bricks are all yellow glazed, but clay coloured underneath that glazing - in which case that arch might be damaged showing the layer underneath the yellow. I really want to see this building cleaned now. That and with its original cornice put back on.