From the winner of Round 3, Col. Sanders:
"You're in the Yokohama landmark tower in cosmos park in the city of Yokohama. It is the tallest building in Japan approx 1000 ft MSL. It was completed in 1993 when I was living in Korea. The building you are looking at is hotel and the big flat roof is a concert hall or something like that. I believe that you are facing Northeast looking at the bay. "
Amy K gets honorable mention, as she nailed it a few hours later. Mr. Ford also had the answer from his extensive research for Kyoto.
My reasoning for the clues given:
A quick review of aerial images on google maps of harbors in Japan would yield the distinctive shape of the island shown. Then the tower information would be easy to find.