The global epidemic of COVID-19 has created changes in the existing industrial ecosystem, and these effects have had a significant impact on the real estate industry as well. Recently, the real estate industry is developing into an industrial field called proptech by applying IT technologies such as big data analysis, virtual reality, and machine learning to the real estate industry. Due to the expansion of non-face-to-face businesses and the ongoing impact of COVID-19, the transition to the platform service sector in the existing real estate industry environment is accelerating. Therefore, this study uses the PPM (push-pull-mooring) model for a real estate brokerage platform that is well known in Korea among the proptech industries, and the reasons for consumers' intention to switch from the existing offline brokerage service to the mobile brokerage platform and their word-of-mouth behavior. As a result of the verification of this study, it was found that the positive relationship between the push factor and the pull factor in the conversion behavior was not significant in the mobile brokerage platform. It was found that mooring, reflecting individual disposition, had a positive effect on the conversion intention of the mobile brokerage platform, and the conversion intention had a positive effect on word-of-mouth behavior. These results show that consumers who want to switch to a mobile brokerage platform are affected by their conversion behavior as a mooring factor (individual innovation, sociality).