The performance guarantee shall be in favor of the municipality in an amount not to exceed 120% of the cost of installation of those improvements required by an approval or a developer's agreement, ordinance, or regulation to be dedicated to a public entity, and that have not yet been installed as shown on the approved plans or plat, including streets, pavement, gutters, curbs, sidewalks, streetlighting, street trees, surveyor's monuments, water mains, sanitary sewers, community septic systems, drainage structures, public improvements of open space and any grading necessitated by the preceding improvements. The developer shall also post a performance guarantee, as part of the principal performance guarantee or by separate performance guarantee, for privately owned perimeter buffer landscaping required by municipal ordinance or imposed as a condition of approval.