This study reports on an experiment in downtown Seattle, Washington, to evaluate whether installing a public real-time multi-modal transportation information display screen in an office building lobby caused changes in building occupant self-reported awareness, attitudes, satisfaction, and usage of alternative transportation modes including transit, car-sharing, ride-sourcing, and bike-sharing services. Workers in the test building and two nearby control buildings were surveyed immediately before the screen was installed (N=550) and again six months later (N=455). Little evidence was found that exposure to the real-time display affected respondent travel choices, satisfaction, familiarity, or attitudes toward alternative modes. Although most respondents (70%) had noticed the screen and had generally positive reactions, two-thirds of this group never actually used it. These results, along with building occupant responses to open-ended questions, indicate limited benefits from this installation and suggest that site selection, screen placement, and marketing may help to maximize the effects of these types of displays on traveler satisfaction and mode shifting.