The purposes of a site plan and architectural review are to permit the city to evaluate site plans and designs of structures to assure compatibility, harmony in appearance in neighborhoods, reduce negative impacts on adjacent properties and coastal visual resources, reduce the unnecessary destruction of the environment and ground cover to avoid the creation of hazardous conditions and drainage problems, to protect views to and along the coast and scenic areas, to minimize the alteration of natural landforms, and to ensure that development is compatible with the character of its surroundings, and subordinate to the character of its setting in designated "highly scenic areas;" to avoid monotonous and otherwise non-aesthetic development injurious to the overall community; to provide a vehicle to encourage full development of streets servicing the properties, and to assure full installation of all public utilities necessary to serve such properties.