Organizational change is an initiative to transition from a current state to a desired future state, where the initiatives can be either planned or unplanned, based on motivational factors. This study evaluates the impact of organizational characteristics and change management strategies adopted by facility management (FM) professionals to implement planned and unplanned changes due to internal and external factors. The implementation of new or innovative workplace strategies (i.e., flexible workspace) were considered as planned changes, whereas changes implemented at facilities in response to the COVID-19 pandemic were considered as unplanned changes (e.g., remote working, safety protocols, etc.). The research team adopted multiple survey-based methodologies to collect information on planned and unplanned change management experiences from FM professionals and employees across the world. Through the help of an FM association, more than 1,500 responses were collected from organizations across 60 different countries. Using machine learning algorithms and other statistical concepts, the research team was able to identify the impact of key organizational attributes, change characteristics, and change management strategies responsible for the successful implementation and adoption of planned or unplanned change initiatives. The research findings provide industry specific recommendations for FM professionals to guide workplace change management efforts and improve the likelihood of successful change adoption within a built environment. With the limited availability of academic research on facility change management, this research can also assist professionals from a variety of occupations (e.g., design, development, human resources, real estate, and other leadership functions) to deliver successful change adoption, for both planned and unplanned change initiatives.