Gorgeous Trees.... but Why?

On my way back towards Matsushima Kaigan station from enjoying the lovely fall light up at Entsuiin Temple, I happened up this shopping complex that I consider fairly new but has been around for a few years now. I remembered them having a Starbucks and wondered if it would still be open as it wasn't that late in the evening yet in my opinion. 

As I grew closer to the building, I noticed that all of the lights were off and it was highly likely any of the shops inside of the building were actually open. A look at some signage confirmed that all of the shops closed around 6:00, which was around the time that I had arrived in Matsushima.

As I looked at the well-lit gorgeous Autumn foliage on the other side of a closed barrier, I had to wonder who this exhibit was set up for. I had imagined myself sitting in a cafe warming up for a moment and drinking some nice hot caffeine. Instead I stood there in the increasingly chilly fall wind, staring at these forbidden trees.

Even with the shorter days, I can't imagine it's worth the increase to the electric bill for this property to keep these trees lit all night when patrons can only enjoy such a view for an hour or so. Why are the lights for the trees still on after the building is closed? 

It was pretty and pretty confusing.