The problem is not simply reflected sunlight. The building has a concave shape which concentrates that reflected sunlight. Concave shapes are fairly unusual in architecture.
Unless the building was designed by a cartoonist, I cannot imagine any competent architectural firm (as opposed to a single designer) submitting such a building as a proposal, let alone constructing one.
There are plenty of CAD rendering programs with ray tracing capabilities which, when coupled with annual solar path data for that location & orientation, could have predicted the exact path and intensity of the focal point for any day of the year.
A number of people made a series of major mistakes. Rectification will be costly.
More info here: http://www.bbc.co.uk/news/magazine-23944679