Cheese grater block

I loved the mono Monday challenge this week - thank you V1K1 and AndrewNZ for an interesting theme. 

So, I was on the look out for a  possible single colour rather than grey scale and walking to Portsmouth centre today what attracted my attention was a blue/grey tone building. It was an office block which was converted a few years ago to student accommodation. It looked very slick, almost silvery in the sunshine. Not quite the colour tone that I was seeking but in extras I have added the ubiquitous autumn coloured leaves.