“Improvement” means streets, sidewalks, storm drainage facilities, water and sewer facilities, utilities, and landscaping to be installed by the subdivider on the land to be used for public or private streets, highways, ways and easements, as are necessary for the general use of the lot owners in the subdivision and local neighborhood traffic, drainage and utility needs and for acceptance of the final map thereof. “Improvement” also means other specific improvements or types of improvements, the installation of which, either by or by a combination of the subdivider, public agencies, private utilities, or any other entity approved by the City, is necessary to ensure consistency with or implementation of the General Plan or any applicable specific plan.