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Local Law 97, passed in 2019, is one of the nation’s most ambitious laws standardizing building-based carbon emissions reductions. It requires most buildings over 25,000 square feet to comply with energy efficiency and greenhouse gas emissions limits starting in 2024, with stricter standards to be imposed by 2030. While the success of LL97 is pivotal to New York City achieving its goal of zero emissions from buildings by 2050, many questions remain about how the law is applied, what property owners need to do to comply, the penalties for non-compliance, and ultimately what needs to happen for the city to meet its climate change goals. The law has already faced legislative and legal challenges and push back from property owners.