217-219 50th Street

Located at 217 and 219 50th St, Brooklyn, NY, this project will retrofit two 4-story affordable housing buildings, each containing eight dwelling units and a cellar. Originally built in 1920 and last renovated in 2007, the buildings will undergo significant upgrades, including the installation of a new panelized overcladding system, new windows, a high-efficiency domestic hot water (DHW) plant, and a unitized heating, cooling, and ventilation system. The interior and exterior lighting will also be upgraded. To minimize disruption for residents, in-unit work will be very limited. The buildings will be fully electrified, eliminating the use of fossil fuels, and rooftop solar panels will help offset the energy demand.

An energy model predicts a post-retrofit average Site energy use intensity (EUI) of 19.3 kBtu/ft²/yr, with total energy consumption estimated at 87,910 kWh/yr. The rooftop solar PV system is expected to generate 50,160 kWh/yr, reducing net energy use to approximately 37,750 kWh/yr. This deep energy retrofit will improve efficiency, resilience, and comfort levels for the residents while advancing the transition to sustainable, carbon-free buildings. This project will be the only deep energy retrofit project completed under NYSERDA’s RetrofitNY program.