All the buildings in Bali until this time (2017) must not exceed 15 meter or around 3rd floor building (the maximum one) and local community regards this as the building is not exceed the height of coconut tree, this is widely acceptable among locals. This doesn't mean that exact measuring of coconut tree, because the height of coconut trees are varies, but only term or symbol that is widely acceptable by locals.
Bali's building height is not higher than coconut trees or maximum 15 meters only
This Bali local regulation made in the early of 1970s.
One of the highest building in Bali is Grand Bali Beach hotel, a 10-floor hotel that was built in 1966, before the regulation was introduced.
The reasons of this regulation are to appreciate local wisdom (Hinduism) and not be higher than the highest pura Bali, which is Pura Besakih. So, it was not exceed this Pura. Also, it aligns with Tri Hita Karana, Bali philosophy, that explains three principles for prosperity is harmony among people, harmony with the nature/environment and harmony with God.
Also, coconut tree has been chosen as symbol of the interaction between environment and people. All parts of a coconut tree ( root, stem, leaf, fruit) are seen to bring benefits to people and community.