the sun - Is it true that the sun goes down to the west?

I live in an 'L' shaped building on the 14th floor, so I have a pretty clear view of the horizon. Up until March 20th of this year, the sun was setting behind the other wing of the building. My living room window faces roughly NW, and on March 21st, I was able to see the sun at the horizon for the first time this year. Each day, the sun will set a little further northwest until it's setting almost directly opposite my window. Then it will begin to retreat until one day in September, when it will begin to set behind the other wing of the building again.

This is the first year I took note of the day that sunset was first visible, and I'm planning to note which day is the last day I can see the sun set.