This case study documents the comprehensive rehabilitation of an aging multifamily residential building in Connecticut. The project involved structural stabilization, modernization of mechanical, electrical, and plumbing systems, energy-efficiency improvements, building-envelope upgrades, and implementation of quality-control methodologies. Through detailed photographic documentation and technical analysis, the study presents a replicable framework for preserving aging housing stock while improving safety, durability, energy performance, and long-term residential sustainability. The methodologies discussed may serve as a practical reference for contractors, engineers, developers, project managers, and housing professionals engaged in multifamily rehabilitation and housing preservation initiatives throughout the United States.