Sacas means "bloom" and the name was selected to symbolize the builders wishes for a "blooming of a new culture at Akasaka". Also, if you enjoy word play, it is noteworthy that saka 「坂」 means "hill" (Akasaka 「赤坂」 can be translated as "red hill") and pronounced backwards, Akasaka Sacas will result in "saka saka saka"...
The Akasaka Sasas illuminations for this year were themed "Harmony" and the main feature were delicate bamboo lights. They will be lit until February 19:
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 18mm
Aperture: F/5.6
Shutter Speed: 1/25s
ISO Sensitivity: ISO 800