In July 1983 the Construction and Planning Administration stipulated that complete plans for soil and water conservation would be required in order to obtain a building permit for hillside property. But many construction companies got wind of the change in advance and obtained permits before the regulations went into effect.
直到民國七十二年七月，營建署對在山坡建屋才有限制，規定要有完整的水土保持規劃才發給建照，但建築商早未卜先知，在新規定公佈前就先拿到建照，至今仍有許多房子持「陳年」建照，在推土、興建中。