Building owners and managers in NYC are all too aware that LL97 fines are imminent, and many are looking for electrification retrofit solutions that are both financially viable and technically constructible. A range of electrification options exist, but a “hybrid” or “flexible” approach is key to capturing as many benefits as possible. (In fact, a recent 2023 MIT Center for Real Estate study* found flexible electrification to be most profitable in 99% of 10,000 scenarios, versus full electrification in 24% of those scenarios, when accounting for changing future greenhouse emission penalties, investments in local electric grid, local real estate market conditions and energy prices.). It’s essential for building owners, managers, and residents to view their asset renewal needs through a decarbonization lens, moving away from simple payback to lifecycle cost analysis and total cost of ownership. It’s equally important to distinguish between asset renewal that is transformational (essential for decarbonization) vs incremental (energy efficiency). We will present an example of a successful hybrid electrification project completed in a Manhattan coop building with an existing hydronic system. This project not only achieves LL97 compliance to 2050 but also benefitted from incentives and support from NYSERDA, and it solved longstanding thermal comfort issues familiar to all NYC residents. *S. Zheng, J. Palacios, A. Valdez, Quantifying The Financial Value of Building Decarbonization Technology Under Uncertainty: Integrating Energy Modeling and Investment Analysis, MIT Center for Real Estate Research Paper No. 23/07. (2023)