Kestrel Nest

This morning as I got off the train headed to work, I glanced up on the corner of the Pepsi Center to see if the pair of kestrels I've seen there before were there again today. As luck would have it, there they were taking in the morning light. It's always a nice way to start off the day seeing them sitting there and I figured they had a nest somewhere nearby but then as I watched the female set off on a shallow glide and landed on the side of this structure on top of the restaurant across the street. She poked her head in the hole in the top left hand corner and then wriggled the rest of the way in! Could it be that I just found their nest?! I snapped this pic with my phone:

This is literally across the street from where I work in downtown Denver. I went back at lunch to see if there was any sign of activity and just after I'd sat down on the grass to watch, the male wriggled his way out, presumably on his way to get "groceries". Wahoo! He didn't return while I was watching but I did see him cruise overhead once more before I left. I know what I'll be doing on my lunch breaks for the next few months! I could trap my next bird on my lunch break in the fall!