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WASHINGTON, D.C. — CoStar has received LEED Platinum for Commercial Interiors (CI)certification for the remodel of its headquarters at 1331 L St. in Washington, D.C. Sustainable features of the building include exclusive use of fluorescent and LED light fixtures, Greenguard-certified workstations and offices, extensive water conservation measures, Smart Building System technology, a green roof garden, and electric car charging stations in the building’s garage. CoStar currently has one LEED Platinum CI office in Boston and two offices in Atlanta and San Diego pending Platinum CI certification. Six of its offices are maintained in LEED-Gold certified buildings.