Parts of the buildings, which are covered with earth and greenery, are used as a multi-purpose square named 'Green Hill' (approximately a 3,000-square-meter lawn), and the parking lot (for 100 passenger cars and 6 buses) is also provided.
またこれらの一部を土で覆い緑化した多目的広場「緑の丘」（芝生約3000平方メートル）と駐車場（乗用車等100台、バス6台）が整備されている。