Before filing of final subdivision plats or recording of minor subdivision deeds or as a condition of final site plan approval or as a condition to the issuance of a zoning permit, the applicant shall furnish to the Borough a performance guarantee and maintenance guarantee to assure the installation and maintenance of certain on-tract improvements. The amount of the guarantee shall be determined by the Borough Engineer, not to exceed 120% of the estimated cost of installation of only those improvements required by an approval or developers agreement, ordinance or regulation to be dedicated to a public entity including: streets, curbs, grading, pavement, gutters, sidewalks, street lighting, street trees, surveyors monuments, water mains, sanitary sewers, community septic system, drainage structures, public improvements of open space and any grading necessitated by the preceding improvements and privately-owned perimeter buffer landscaping. At the developer's option, a separate performance guarantee may be posted for the privately-owned perimeter buffer landscaping.