I took this picture as I was leaving the school in the evening.  I noticed that the letters in the window cast a shadow in the stairwell. Another nice sunset at Sunrise English School!

as I was leaving: （教室を）出る途中　noticed: 気づいた

cast a shadow:　影を落とす／投げ掛ける stairwell: 階段の吹き抜け

sunset: 日没