Larsen and Toubro Infotech today began work on a 5,000-seat software centre. The construction of the twin tower (designated L&T Technology Centre -II), is expected to be completed in about 18 months."The proposed L&T Technology Centre-II signifies the long-term aggressive growth that L&T Infotech is poised to achieve. We are rapidly building facilities like this to take advantage of upcoming opportunities, " A M Naik, chairman & managing Director, L&T, and chairman, L&T Infotech, said.