By Michael Herzenberg New York City UPDATED 7:14 AM ET May. 26, 2021 PUBLISHED 6:07 PM ET May. 25, 2021 PUBLISHED 6:07 PM EDT May. 25, 2021 SHARE You may have noticed that letters are not just for grading restaurant cleanliness in the city anymore. Letter grades are now telling you how environmentally clean buildings bigger than 25,000 square feet are. What You Need To Know 825 Third Avenue is undergoing $150 million renovation "Every component of that work has been selected in order to provide a more sustainable, healthy environment," said Ashlea Aaron, the Senior Managing Director of Commercial Leasing at the Durst Organization Despite renovations owners say they can't guarantee avoiding fines from a carbon cap imposed by City Council. Fines begin in three years