approximately 7,500 people currently live and work in this new "city within a city". with the overall expansion, which is expected to be completed in 2012, the population could increase to 15,000. international companies such as ibm, sanofi-aventis and bauholding strabag se are also located in donau city. also established are well-known high-tech companies that deal with their employees and scientific institutions in vienna's first science and technology park, tech gate vienna.