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If you are looking for quality ballet classes with pointe and or pilates. I would recommend these two ballet studios. I am aware that there are a lot of places that you could try for ballet classes here in Tokyo but based on my Japanese friends recommendations, this is the closest you can get to good and professional training. Not much RAD the training here is closer to Vaganova training, but it still depends on the teacher that you get. My favorite teacher here is Teacher Lesli, try her classes if you get the chance.
Above is the link to their english website. Very much gaijin friendly, they teach classes in English here and they have great teachers. They offer classical ballet classes, contemporary dance classes, workshops and many other events.
LOCATION: ACCORDING TO THEIR WEBSITE ( I would recommend the first option because it is the easiest way to locate their place ) If in doubt ask people where PORT BOWL is.
7min walk from JR Tamachi-Station
Tamachi-station Shibaura-exit. Go straight, then turn left at the first traffic light and straight on for approximately 5min. Enter Tokyo Port Bowl building at A-entrance. 4th floor.
7min walk from Subway(Toei-line) Mita-station
Mita-station A6-exit. After exiting, take right and then turn right at the first corner. Go pass the shrine and take the promenade that goes under the JR railway. Go straight, then turn left at the first traffic light and straight on for approximately 2min. Tokyo Port Bowl will be on your left,from A-entrance. 4th floor.
Cost: Yen 3000 per walk in one class, they also have a cheaper option for one month or two months of classes! Most of their information is now available online. Some classes are cheaper for the B classes and the C classes.
Not as Gaijin friendly as Architanz but their staff can speak a bit of english and you will enjoy this if you are a fan of RAD style of dancing. Also ballet is ballet so you will of course have no problem understanding the exercises. The teachers here are part of one of the most famous ballet companies in Japan, the Asami Maki ballet. I tried Teacher Mami here and she really gave a simple yet complex class.
How to get there: Take the A4 exit from Omotesando station If you can see the star on the Map that is the exit. Head to the left and go straight all the way. On the next main road take another left walk a little further and you will see this building on the right side.