We present a unique urban computing testbed for studying the utilization of ubiquitous computing technology in the public urban space of a city center. The testbed comprises of a wide range of pervasive computing infrastructure and different middleware resources. We demonstrate the applicability and benefits of the testbed in evaluating technology pilots and prototyping new ubiquitous services in real-world urban setting. We conclude with a discussion on the challenges in deploying this kind of a large-scale testbed in a public urban space.