From Name: From Email: To Name: To Email: Optional Message: Nyc starts grading larger buildings on energy efficiency as some owners cry foul from Commercial Observer Expect to see plenty of “C” and “D” grades in New York City office buildings from now on. The law requiring residential and commercial buildings of more than 25,000 square feet to post a letter grade — ranging from A to F — near a public entrance went into effect Oct. 1, meaning about 40,000 properties have until the end of October to put up the signs, according to the New York City Department of Buildings (DOB). more 7701 Las Colinas Blvd., Ste. 800, Irving, TX 75063