The Arlington County Green Building Density Incentive Policy applies to special exception site plan requests for bonus density and/or height. The program uses the LEED rating system as a standard for measuring each project. The floor area ratio (FAR) bonus depends on the level of LEED Certification and building type (commercial, high-rise residential). The County established a Green Building Fund; builders that do not commit to a LEED rating contribute to the Fund. The contribution is calculated at a rate of $0.045 per square foot. (This calculation is based on the fees assessed by the U.S. Green Building Council for registration and evaluation of a formal LEED application.) The Green Building Fund is used to provide education and outreach to developers and the community on green building issues. Developers must post a bond or letter of credit before a certificate of occupancy is issued. If a project receives LEED certification from the USGBC, the Fund contribution is refunded upon receipt of the final LEED certification. If 3 LEED points are missed, 50% of the bond is forfeited to the county. If 4 or more points are missed, all of the bond is forfeited to the county.